What is a LIGHT CONE?
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- Опубликовано: 8 фев 2025
- What are Light Cones and Spacetime Diagrams? What is it's importance in Relativity?
In this video I give a concise explanation to these questions.
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Looked for it everywhere, this is probably the best explanation on the internet. Short but precise and covering all the necessary concepts.
For those who are curious, the slope for photons' movement is 1 because they travel at the speed of light(c), and for simplicity's sake, Physicists set the value of c as '1' to simplify the calculations and make the visualizations easier with respect to other fundamental constants. Therefore, c=1 ⇒ Δx/Δt =1 i.e. θ = 45º
tan(pi/4-θ/2) me thinks.
nah its because the time axis is actually ct, not t
I have doubt in this topic but now this topic is crystal clear for me😊
Mind blown in less than 2 minutes. This is going to take some pondering.
I absolutely love it when I understand a concept in physics, but, it is the hardest thing in the world
Thank you so much, best explanation on the internet.
1:43 ... Thank you. Such a lovely reminder. 🖤🖤🖤.
Short and clear. Great
That was an excellent and concise explanation. Thank you!
Very concise, thank you so much!
Very good explanation.Tks.Hugs from Brasil
A light cone… that’s when the ice cream parlor skimps on your order, right?
THANK YOU
Nicely explained. 😁
sir please make a detailled video ion this
While I get why the inverted cone is shaped the way it is going in the future, I cannot understand why it is shaped downside up in the past. Why would a light that is moving away come to a point in the presen??
I think what downward cone means all the possible path that past events that can take to arrive at the current moment. Its not moving into past. Its multiple different past events that can arrive to present.
Will you "once upon a time" do some General Relativity too?
Very good
Wish there was no music. Very distracting.
Sir....for photons why the slope is 1??
x axis v/s ct axis
Slope is x/ct = v/c = 1 for photon.
Because the velocity of photon is constant 🙂
@@FortheLoveofPhysicsplease remove the music.
Why is the y-axis ct and not just t?
So the worldline of a light photon has slope 1
Most of yall are probably nerds like me. Do you know if cones absorb more light that simple cylinders? I'm trying to make a super strong telescope and I was wondering what would happen if I put a conical shape at the end of the optical tube. Would it gather more light and send it to my eye? If it does should it be a super reflective material or a matte black? I'm thinking that matte black would absorb more light from the surrounding area but what if stops some important light from making it to my eye? Would reflective material like Alfoil be better? This is important cause I'm tryna achieve something big and google doesn't always have the answers.
I don’t understand. Doesn’t light spread 360 degrees? Why 90?
It is travelling through time dimension. The spread is only in two spacial dimensions for demonstrative purposes. At time zero, it is just a point, at time 1 sec it is a circle with radius of c*1 second, in 2 second the radius of the circle is c*2 seconds and so on, so you get a cone shaped time line. In reality you have a series of spheres inside each other but that is hard to visualize.
Why the music? It's really annoying!
Sir Please upload a video on Feynman diagram
Sir I have a question
I a quantity say x is directly proportional to another quantity say y, does it imply that y is also directly proportional to x i.e., is proportionality true in both directions
@@basharatmalik2004 in a purely mathematical way, yes.
@@basharatmalik2004
No at all. Because one is cause and another is effect. So only one quantity must be proportional to the another but not the reverse. Like kinetic energy is proportional to velocity squared but not velocity is proportional to square root kinetic energy. Similarly current is proportional to potential difference but not potential difference is proportional to current.
@@jewett425 But doesn't this break the meaning of an equation.
Because by definition, two quantities are proportional, if they ratios are equal.
Suppose at some instant quantity a has value a1 and b has b1 and then their values change to a2 and b2, then a and b are directly proportional if a1/b1= a2/b2
So nothing that we do remotely effects a black hole. But what if the singularity of a blackhole is on the cusp of a light cone. Then what we do may let matter and energy transfer into the blackhole .. either Its a stupid or genius thought😂 just saying
You just showed why schools should bring back chalkboards. Try that side shading effect with an expo.marker haha. Not happening.
@vesaversion298 thank you so much, I just went looking for what slope 1 meant!
The music background is stupid. Why distract people while at the same time teach them something. SMH.
Please eliminate the music.