Question

The curve drawn between velocity and frequency of photon in vacuum will be a

• A. straight line parallel to frequency axis
• B. straight line parallel to velocity axis
• C. straight line passing through origin and making an angle of $45^{\circ}$ with frequency axis
• D. hyperbola

Answer 1

Answer: (A)

straight line parallel to frequency axis

Answer 2

Graph between frequency and velocity is a straight line which is parallel to frequency axis. Because according to the relation $v=n \lambda$, as frequency increases, wavelength decreases and so, velocity remains constant.