Using a graph to find half-life time - IGCSE Physics

A brief explanation of how to find the half-life time of a radioactive substance.

[@amirkhan-co3oq]

Thanks a lot bro the revision book i have didnt explain properly but you sir saves my day

[@RobYT]

fax

[@prettylife6086]

so easily explained and straight to the point i loved it ty lad !

[@ChrisGozzardThatPhysicsGuy]

NP

[@mage6749]

hey man just wanted u to know that u saved my life... my teacher went over this briefly and I didn't understand. thanks for this!!!!!!!!!!

[@ChrisGozzardThatPhysicsGuy]

Awesome

[@carthaginian7792]

hey...im a student of igcse and pretty soon ill be taking my exams in May...therefore,itll be great if you upload a video of the decay curve with background radiation..itll be really helpful cuz i find your videos very comprehensible

[@cronkemerson3791]

Carthaginian 779 oof damn good luck

[@ironone4438]

What have u done?

[@isarashid515]

How was it

[@ChrisGozzardThatPhysicsGuy]

😄

[@saabiq1441]

this might be a dumb question cuz im dumb but so what was the half life

[@alicezeee6335]

I think it’s 1 year as it takes 1 year to half the radioactive % each time

[@ChrisGozzardThatPhysicsGuy]

😀

[@abby7166]

thank you so much, but i'm still so confused. Any recommendations of more in depth videos?

[@ChrisGozzardThatPhysicsGuy]

hmmm... I can't think of any. What about half life don't you get / is confusing you?

[@abby7166]

Nothing specific, but just the half life thing all together. I managed to figure it out with a teacher today, but thank you so much for the help!

[@ChrisGozzardThatPhysicsGuy]

Pleasure. Just practice losts of past paper problems. It's not so bad. Have a good day!

[@whacki6428]

Bro ur a life saver

[@ChrisGozzardThatPhysicsGuy]

Thx

[@br0ke377]

yoo thanks bro got an exam for this tomorrow

[@ChrisGozzardThatPhysicsGuy]

😀

[@memainiotorete]

tysm, still helpful to this day

[@ChrisGozzardThatPhysicsGuy]

Oh yes!

[@NathanWells41968]

thanks, i got an exam tomorrow. this really helped

[@ChrisGozzardThatPhysicsGuy]

Cool

[@YemeliSteve-vg7lv]

Thanks very much, I'm relieved sir ❤

[@dakid7482]

very good explanation, thanks alot

[@ChrisGozzardThatPhysicsGuy]

👌

[@warren2963]

What do you do if the graph doesn't have a curve ?

[@ChrisGozzardThatPhysicsGuy]

Panic

[@amirabidali8113]

@@ChrisGozzardThatPhysicsGuy LOL

[@heavytenrook]

thanks! this was super helpful

[@ChrisGozzardThatPhysicsGuy]

No problem!

[@nafsii04]

thank you so much

[@ChrisGozzardThatPhysicsGuy]

🤗

[@brianntshambiwa3904]

Life saver❤👍🏼

[@ChrisGozzardThatPhysicsGuy]

Life jacket

[@yourlocalairbreather1260]

thank u for this sir

[@ChrisGozzardThatPhysicsGuy]

Gangster

[@asharibhussain9915]

How to determine background count rate value?

[@ChrisGozzardThatPhysicsGuy]

I need to make a video on this..

[@bricksstopmotions6758]

Thank you for helping me with my homework

[@ChrisGozzardThatPhysicsGuy]

Pleasure

[@deadlygamer9258]

​@@ChrisGozzardThatPhysicsGuy bro u replying even after 8 years???? U r the true one

[@ChrisGozzardThatPhysicsGuy]

@@deadlygamer9258 dang thx

[@MagnaSam]

cheers chris lad

[@ChrisGozzardThatPhysicsGuy]

Cheers Magna lad

[@imaadusf1860]

Thanx man

[@ChrisGozzardThatPhysicsGuy]

Pleasure

[@beautifultradgedy9725]

Thank you very much :)

[@ChrisGozzardThatPhysicsGuy]

Only a pleasure..

[@3co215]

cheers man this helped

[@ChrisGozzardThatPhysicsGuy]

Pleasure!

[@mr.brightside025]

if 50 is not given on the y axis then how can i calculate it? can anyone help please?

[@zainabdiaaalsakhen9054]

How I can get initial activity from graph sir?

[@ChrisGozzardThatPhysicsGuy]

😋

[@worldofconspiracy3997]

thanks

[@ChrisGozzardThatPhysicsGuy]

+World of Conspiracy np

[@hannahwolfy7243]

So was 1 the half life ?????????????????

[@ChrisGozzardThatPhysicsGuy]

hannah wolfy in this case yes

[@joshuaelijahtucker]

thanks man

[@ChrisGozzardThatPhysicsGuy]

🤣

[@sukhmanpreet1269]

Thanks brother

[@AradOkanin]

is there any formula to find it though?

[@ChrisGozzardThatPhysicsGuy]

yes but too advanced for igcse.

[@ChrisGozzardThatPhysicsGuy]

Yes I am.

Chris Gozzard Alright. I'm not surprised.

[@ChrisGozzardThatPhysicsGuy]

Thanks. How did you come across my videos? Google?

[@ChrisGozzardThatPhysicsGuy]

So did my students. :)

[@muskanshahid7348]

Thanxx

[@ChrisGozzardThatPhysicsGuy]

Pn

[@hardikpanjwani]

In a graph with background radiation, the curve moves upwards and instead of tending to zero the asymptote tends to the background radiation level. So all you have to do is move the entire curve down by that amount and you have subtracted the background radiation. Now you can calculate the half life as you have shown in your video.

[@ChrisGozzardThatPhysicsGuy]

I made another video with background included I think.

[@hardikpanjwani]

I looked for it but could not find it. Can you kindly provide a link?

[@ChrisGozzardThatPhysicsGuy]

+Hardik Panjwani hi there. sorry - can't find it. I will do again when free.

[@artsaintdhimathera3366]

Wait so whats the answer?

[@ChrisGozzardThatPhysicsGuy]

42

[@44DEADguy]

what about the background radiation?

[@ChrisGozzardThatPhysicsGuy]

Hi. ahmad taika I've not included background radiation to keep the process simple for my students to understand. With background radiation the graph is transposed upwards and instead of tending to zero it tends to the background radiation level.

[@ChrisGozzardThatPhysicsGuy]

ahmad taika Am I making sense? Maybe I should make a video including the background radiation level too..

[@44DEADguy]

yeah, it makes sense but a video would be nice. :)

[@ChrisGozzardThatPhysicsGuy]

ahmad taika Are you taking A level or IGCSE Physics?

[@44DEADguy]

Cambridge IGCSE

[@jawadabbas1345]

so whats the answer then

[@ChrisGozzardThatPhysicsGuy]

42

[@ChsonlineOrgUkinternetschool]

Interesting

[@ChrisGozzardThatPhysicsGuy]

Hmmmm

[@lilliankidd2359]

TYSM YO

[@ChrisGozzardThatPhysicsGuy]

NP

[@Ebtnoob]

No way half life reference

[@ChrisGozzardThatPhysicsGuy]

Hey?

[@greysonschomaker8688]

:)

[@ChrisGozzardThatPhysicsGuy]

☺

[@jediael9906]

Still don't got a damn clue

[@ChrisGozzardThatPhysicsGuy]

shame..

[@TabithaChabinga]

😂😂

[@ChrisGozzardThatPhysicsGuy]

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[@Mineal20301]

that is the worst possible definition i've ever heard

[@ChrisGozzardThatPhysicsGuy]

Wow. Bold statement. Care to explain?

[@azyle2104]

@@ChrisGozzardThatPhysicsGuy lol did you notice that comments like these never have depth to them , it's just a blank statement with no support

[@azyle2104]

@@ChrisGozzardThatPhysicsGuy never have I seen a rude comment being backed up tbh 😂

[@azyle2104]

@@ChrisGozzardThatPhysicsGuy lol wth , I just watched this video , it's so concise , idk wassup with him