Question

In a laser tube, all the photons

• A. have same wavelength
• B. have same energy
• C. move in same direction
• D. move with same speed.

Answer 1

The correct option is D move with same speed.

The photon produced in a laser move at the speed of light and it is constant for all the photons. $(c=3\times {10}^{8}m/s)$.

Practically the light from the laser has slight variations in their wavelength and the frequency. So, they cannot be same.