Question

Pick out true statements from the following :
(a) The rest mass of photon is zero
(b) $\pi$ -meson in nuclear field is analogous to photon in electromagnetic field
(c) Neutral $\pi$ -meson decays into two $\gamma$ -ray photons
(d) Graviton of gravitational field has an integral spin

• A. a,c and d
• B. a and b
• C. a,b,c and d
• D. a,b and d

Answer 1

The correct option is C a,b,c and d

a] Rest mass of photon is zero. Photon has no mass.
b] True.
c] ${\pi }^0\to \gamma +\gamma$
d] True.