Question

Which is the incorrect statement of the following?

• A. Photon is a particle with zero rest mass
• B. Photon is a particle with zero momentum
• C. Photons travel with velocity of light in vacuum
• D. Photons even feel the pull of gravity

Answer 1

Answer: (B)

Photon moves with speed of light ie,
v = c and rest mass of a particle is
$m_0$=m$\sqrt{1-v^2/c^2}$
hence $m_0$(photon)=0
$\therefore $ photon has zero rest mass.
Momentum of photon = $\frac{h}{\lambda}$