Photon Momentum and Effective Mass  Summary and Q&A
TL;DR
The video explains how to calculate the momentum of a photon using Planck's constant and the wavelength of the photon.
Questions & Answers
Q: How can the momentum of a photon be calculated?
The momentum of a photon can be calculated by dividing Planck's constant by the wavelength of the photon. This formula is derived from the equation for the energy and rest mass of the photon.
Q: What is the significance of a photon having no rest mass?
The fact that a photon has no rest mass means that its energy is solely dependent on its momentum, and changing the wavelength of a photon will cause a change in its momentum.
Q: How does changing the wavelength of a photon affect its momentum?
Changing the wavelength of a photon directly affects its momentum. Decreasing the wavelength increases the momentum, while increasing the wavelength decreases the momentum.
Q: What is the effective mass of a photon?
The effective mass of a photon, which is treated as mass in the momentum equation, is determined by dividing Planck's constant by the wavelength of the photon and multiplying it by the speed of light.
Summary & Key Takeaways

The momentum of a photon can be calculated using Planck's constant divided by the wavelength of the photon.

The derivation of the formula for calculating the momentum involves the energy and rest mass of the photon.

Changing the wavelength of a photon causes the momentum to change as well.