Particle Physics (26 of 41) What is a Photon? 10. Momentum and Velocity

In this video I will calculate the momentum and velocity of a mass-less photon.

Next video in the Particle Physics series can be seen at:

[ManojTiwari-kyfl]

We are really thankful for such a imaginative and crystal clear explanation with numericals... :)

[jeffreyluciana]

Your explanations are very simple and elegant. Shows a mastery of the subject

[منوعات-تف]

shouldn't we subtract final momentum from initial momentum ? and get a negative momentum

[Afedekik]

i wasted my life learning and worshiping biology. This should be my thing. SAD!

[qualquan]

You are generally very good but how could you say at the very outset that a photon has no mass without immediately qualifying it by saying that a photon has no REST mass. Every travelling photon at speed C must have mass because E=mc^2 where E = moving photon whose mass = E/C^2 = hf/C^2. Thus photonic mass is directly proportional to frequency and shows BOTH gravity and inertia.
Your previous lecture on Compton was very good.