@@amir_hamzah 95% of your furniture, we build houses with them, we do art with them, we keep us warm with them, we can breathe because of them, most of the fruit grow out of them.
Years ago, I started work in dendrochronology via a 'crash course' in the field with an experienced, expert dendrochronologist. 20 years later, and many a tree cored, dated and cross-dated, I would dearly have loved to have seen this when I had to examine my first tree core. Hell, coring a large tree effectively (getting the core to go directly to the center pith to year zero) is a skill all to itself. Because we were doing ecological dendrochronology (looking at the ecology of the forests via tree ring growth and anomalies), we did not do coring at DBH (breast height). Instead, we had to get on our hands and knees, and core at the base of the tree, just above the root and at ground level....which made it much more challenging, and I always envied the foresters who could have the luxury of DBH coring. Great work Dave! If I only had this tutorial the first time.....would not have made a fool of myself in that lab so many years ago (p.s. the expert dendrochronologist became my best friend and life-long teacher and research partner - tree rings taught me a lot about life in general!).
Aside from the jokes, which by the way are pretty good. I don’t think I’ll need this information much ever unless in 4 or 5 years my grandson has a question. But it was really interesting and I watched to the end, as I do all PD’s videos. Thanks and Keep it up Dave.
Compression and tension wood. This is the first time I've encountered those concepts in dendrochronology, but they make perfect sense. Thanks, Professor Dave!
I've seen dendrochronology used to date buildings by taking core samples from beams in the attic and other parts of the building. Given that those will be pieces of wood that have already been worked, how is it known that the beam or whatever uses the oldest part of the tree, the first ring in effect?
I think dendrochronologists have kind of time tables made with multiple samples of tree rings for each areas. Dry years produce thinner rings, wet years produce thicker rings, often there’s particular successions of dry/wet/normal etc. If you have samples of which you know exactly the age, you can tell exactly in what years each ring was produced and know from its thickness if the year was wet or whatever. Now when you have a piece of unknown wood you simply compare it with the catalogue of dated samples and try to find a match. Trees are different but two trees same species same area will have very similar growth patterns so it’s possible to date things. Disclaimer: this is my guess from what I heard from other sources so take with caution.
I contracted herpes' I was told there is no Herpes cure except treatment to control it. I totally lost hope. All I could think was losing my life because it was so embarrassing to have this virus, few weeks ago I read about a possible natural cure which was guaranteed. And I ordered the treatment after some weeks I got 100% cure. Now I'm so excited to share this testimony thanks Dr okougbo Email:dr.okougboherbalhome@gmail.com.
Interesting you act like a very effective algorithm I just started watching dendrochronology videos two days ago and now come out with a video about that. :D
I contracted herpes' I was told there is no Herpes cure except treatment to control it. I totally lost hope. All I could think was losing my life because it was so embarrassing to have this virus, few weeks ago I read about a possible natural cure which was guaranteed. And I ordered the treatment after some weeks I got 100% cure. Now I'm so excited to share this testimony thanks Dr okougbo Email:dr.okougboherbalhome@gmail.com.
I contracted herpes' I was told there is no Herpes cure except treatment to control it. I totally lost hope. All I could think was losing my life because it was so embarrassing to have this virus, few weeks ago I read about a possible natural cure which was guaranteed. And I ordered the treatment after some weeks I got 100% cure. Now I'm so excited to share this testimony thanks Dr okougbo Email:dr.okougboherbalhome@gmail.com.
Hello Professor Dave. I have seen you heave done a few videos on many different cycles. I know you videos are pretty advanced but could you do a video on rocks and the rock cycle...? (P.S interesting video. more complex than I thought :D)
Professor dave I have a quantum chemistry question. In the s orbital of hydrogen, the electron has a nonzero chance of being found at the nucleus. If this is true, why doesnt hydrogen undergo an electron capture reaction the second the electron comes into contact with the nucleus? There must be other forces present, but I do not know them.
@Zishang Wu you could calculate the Q value for the reaction and if it's negative the reaction is not spontaneous or energetically favorable. I know heavier elements have 1s or 2s electrons with probabilities of being found in the nucleus. Pretty sure hydrogen has the same where the electron can be found at the nucleus but im.not sure what that means. The nucleus isn't a physical object in many ways. Different physics
@@lorddonk9806 Okay, I kind of understand what point you are making rn. To start off, Im not trying to answer this question but giving some thoughts based on the my previous knowledge. The most simple case of this problem will be the electron (if u just consider it as a particle) will just stay on whatever orbitals of hydrogen based on the pact of energy you gives to it (ranges from 0eV to some finite maxima), and it will not collapse into the nucleus if you are putting in energy. So to put electron inside of a nucleus there are several assumptions we should make. First of all, the electrons should not just be a particle but more like something with particle-wave duality because if it is a particle, it will never enter the nucleus under the restriction of the Bohr model. That being said, an electron can only interact with the nucleus with its wave characteristic (imagine it have a certain part of the wavelength overlapping with the nuclei). Based on this, I can make two more speculations. Having the idea that giving a certain pact of energy will lift the electron to a higher energy level in mind, letting an electron fallen into a nucleus will just be an opposite process (electron is losing energy from the perspective of electron). However, if there is no outer source (photon for example), how does the electron in the atom varies its energy? IMO, I think it is proton in the nucleus having a pull on the electron and the force is big enough to drag the electron out of its original orbital (it required to have a proton number that is way larger than the number of e- in the innermost orbital). While, there is also a possibility that the proton and electron is so close in distance that they interact with each other. So, it might seem to us that the electron is dropping in energy but the reality is proton attracting on the electron which lower the whole energy of the system at that instant. What will be the compensation then? If the system drops in energy, there must have something that gain in energy to balance it off according to conservation of energy. To answer this question, we should know the charge balancing effect between electron and proton. The opposite charges will interact with each other and will essentially gives us a neutron at the end of the day. As a result, the number of proton will change and what we get is a different element. The energy will be balanced by giving out a neutrino and a gamma ray. Back to your question: "why doesnt hydrogen undergo an electron capture reaction the second the electron comes into contact with the nucleus?" My answer is, it is mathematically and physically impossible. Because if you only have one proton and it attracts the only electrons on the orbital, what you will get is a neutron, but what kind of element it will be then?
More simple answer: Hydrogen atom is the simplest atom in the world. It's just a proton and an electron. Its stability is due to the stability of the proton and the electron. As we know the proton and the electron do not decay into smaller particles.
I never knew much about this subject, but now I do! Thanks Prof Dave!
I like trees, they are so interesting and useful.
Name me one good thing trees are good for?
@@amir_hamzah blocking my line of sight from you
@@amir_hamzah
95% of your furniture, we build houses with them, we do art with them, we keep us warm with them, we can breathe because of them, most of the fruit grow out of them.
Years ago, I started work in dendrochronology via a 'crash course' in the field with an experienced, expert dendrochronologist. 20 years later, and many a tree cored, dated and cross-dated, I would dearly have loved to have seen this when I had to examine my first tree core.
Hell, coring a large tree effectively (getting the core to go directly to the center pith to year zero) is a skill all to itself. Because we were doing ecological dendrochronology (looking at the ecology of the forests via tree ring growth and anomalies), we did not do coring at DBH (breast height). Instead, we had to get on our hands and knees, and core at the base of the tree, just above the root and at ground level....which made it much more challenging, and I always envied the foresters who could have the luxury of DBH coring.
Great work Dave! If I only had this tutorial the first time.....would not have made a fool of myself in that lab so many years ago (p.s. the expert dendrochronologist became my best friend and life-long teacher and research partner - tree rings taught me a lot about life in general!).
Aside from the jokes, which by the way are pretty good. I don’t think I’ll need this information much ever unless in 4 or 5 years my grandson has a question. But it was really interesting and I watched to the end, as I do all PD’s videos. Thanks and Keep it up Dave.
I experienced early wood a few hours ago.
You really can't find the knowledge presented on this channel anywhere else, Thanks professor
I agree but Khan Academy is Also Great
@@deathnote4171 certainly both channels are awesome and greatly informative.
Angrycatfish Briggs can show you how common the knowledge use to be..
prof. Dave is the only reason my grades are above 50%
Are you in highschool or an undergraduate?
@@K4inan 3rd grade. It's a very exclusive school.
Compression and tension wood. This is the first time I've encountered those concepts in dendrochronology, but they make perfect sense. Thanks, Professor Dave!
Very interesting. I remember arguing about dendrochronology with a creationist once. I could've used this.
Every time we get into a new topic at school you explain it 😃
Just send a copy of your syllabus to Prof. Dave, might help.
Most days I get early wood but sometimes when I’m drunk I get late wood !!!!!!!!!
My wife prefers late wood to early wood, at my age I'm happy with any wood!
Mind you old age just takes the pith!
That was rather pithy.
this was awesome - thanks !
We luv u jesus
Just subscribed, I love your videos! I watched you on the scimandan podcast and I have been watching your videos ever since then
I’m very familiar with early wood. I get it most mornings when I wake up.
Yes
i bet fe'ers will say its fake just because its you
Thank you! I had the definitions of all these types of wood wrong!
Except ReactionWood - that is definitely what happens when a man sees a nice booty
History pole shift ect lol 🙄
I learned a lot. Now I'm going to make like a tree; and get out of here.
I've seen dendrochronology used to date buildings by taking core samples from beams in the attic and other parts of the building. Given that those will be pieces of wood that have already been worked, how is it known that the beam or whatever uses the oldest part of the tree, the first ring in effect?
I think dendrochronologists have kind of time tables made with multiple samples of tree rings for each areas. Dry years produce thinner rings, wet years produce thicker rings, often there’s particular successions of dry/wet/normal etc. If you have samples of which you know exactly the age, you can tell exactly in what years each ring was produced and know from its thickness if the year was wet or whatever.
Now when you have a piece of unknown wood you simply compare it with the catalogue of dated samples and try to find a match.
Trees are different but two trees same species same area will have very similar growth patterns so it’s possible to date things.
Disclaimer: this is my guess from what I heard from other sources so take with caution.
i like plants, i like animals more but i want to know more about them too
Treeeeeees!
you are the jesus of science
I contracted herpes' I was told there is no Herpes cure except treatment to control it. I totally lost hope. All I could think was losing my life because it was so embarrassing to have this virus, few weeks ago I read about a possible natural cure which was guaranteed. And I ordered the treatment after some weeks I got 100% cure. Now I'm so excited to share this testimony thanks Dr okougbo Email:dr.okougboherbalhome@gmail.com.
Can you please have a look at Angrycatfish Briggs & show how our moon has been cartwheeling due to our earths extra tilt?
Amazing❣️... Just stunned...Thank You👏🏼😌♥️
Interesting you act like a very effective algorithm
I just started watching dendrochronology videos two days ago and now come out with a video about that. :D
Ahhh, I thought this video was going to tech me how to fix my phone,
Tree rings isn’t that an Irish Circus 🎪
🥰 🌴🌲🌳☺
I contracted herpes' I was told there is no Herpes cure except treatment to control it. I totally lost hope. All I could think was losing my life because it was so embarrassing to have this virus, few weeks ago I read about a possible natural cure which was guaranteed. And I ordered the treatment after some weeks I got 100% cure. Now I'm so excited to share this testimony thanks Dr okougbo Email:dr.okougboherbalhome@gmail.com.
Waiting for your video on morning wood.
I contracted herpes' I was told there is no Herpes cure except treatment to control it. I totally lost hope. All I could think was losing my life because it was so embarrassing to have this virus, few weeks ago I read about a possible natural cure which was guaranteed. And I ordered the treatment after some weeks I got 100% cure. Now I'm so excited to share this testimony thanks Dr okougbo Email:dr.okougboherbalhome@gmail.com.
haha "earlywood"
T R E E
So does the tension wood of angiosperms kinda act like a rope then?
BOTANY: Do they perceive like us?
Helped me a lot. Thanks professor dave!
Cool
I’ma take “reaction wood” out of context
Professor Dave is the best. Thank you for the content.
Hello Professor Dave. I have seen you heave done a few videos on many different cycles. I know you videos are pretty advanced but could you do a video on rocks and the rock cycle...? (P.S interesting video. more complex than I thought :D)
the geology series is being written as we speak!
Time to learn about wood
I got reaction wood right here!
Great video Dave!
Sei il miglior insegnante!
AMAZING
*W O O D*
Professor dave I have a quantum chemistry question.
In the s orbital of hydrogen, the electron has a nonzero chance of being found at the nucleus.
If this is true, why doesnt hydrogen undergo an electron capture reaction the second the electron comes into contact with the nucleus?
There must be other forces present, but I do not know them.
interesting
What I know is the electron density in the nucleus is always zero just by observing the electron distribution probability graph of hydrogen
@Zishang Wu you could calculate the Q value for the reaction and if it's negative the reaction is not spontaneous or energetically favorable.
I know heavier elements have 1s or 2s electrons with probabilities of being found in the nucleus. Pretty sure hydrogen has the same where the electron can be found at the nucleus but im.not sure what that means. The nucleus isn't a physical object in many ways. Different physics
@@lorddonk9806 Okay, I kind of understand what point you are making rn. To start off, Im not trying to answer this question but giving some thoughts based on the my previous knowledge.
The most simple case of this problem will be the electron (if u just consider it as a particle) will just stay on whatever orbitals of hydrogen based on the pact of energy you gives to it (ranges from 0eV to some finite maxima), and it will not collapse into the nucleus if you are putting in energy. So to put electron inside of a nucleus there are several assumptions we should make. First of all, the electrons should not just be a particle but more like something with particle-wave duality because if it is a particle, it will never enter the nucleus under the restriction of the Bohr model. That being said, an electron can only interact with the nucleus with its wave characteristic (imagine it have a certain part of the wavelength overlapping with the nuclei). Based on this, I can make two more speculations. Having the idea that giving a certain pact of energy will lift the electron to a higher energy level in mind, letting an electron fallen into a nucleus will just be an opposite process (electron is losing energy from the perspective of electron). However, if there is no outer source (photon for example), how does the electron in the atom varies its energy? IMO, I think it is proton in the nucleus having a pull on the electron and the force is big enough to drag the electron out of its original orbital (it required to have a proton number that is way larger than the number of e- in the innermost orbital). While, there is also a possibility that the proton and electron is so close in distance that they interact with each other. So, it might seem to us that the electron is dropping in energy but the reality is proton attracting on the electron which lower the whole energy of the system at that instant.
What will be the compensation then? If the system drops in energy, there must have something that gain in energy to balance it off according to conservation of energy. To answer this question, we should know the charge balancing effect between electron and proton. The opposite charges will interact with each other and will essentially gives us a neutron at the end of the day. As a result, the number of proton will change and what we get is a different element. The energy will be balanced by giving out a neutrino and a gamma ray.
Back to your question: "why doesnt hydrogen undergo an electron capture reaction the second the electron comes into contact with the nucleus?" My answer is, it is mathematically and physically impossible. Because if you only have one proton and it attracts the only electrons on the orbital, what you will get is a neutron, but what kind of element it will be then?
More simple answer: Hydrogen atom is the simplest atom in the world. It's just a proton and an electron. Its stability is due to the stability of the proton and the electron. As we know the proton and the electron do not decay into smaller particles.
💙
everybody knows trees are dead giants, I seen it on youtube ;P