Particle Nature Of Light

A sodium street lamp emits yellow light of wavelength $$ Assuming it to be efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is:
1.
2.
3.
4.

The number of photons per second on an average emitted by a source of monochromatic light of wavelength , when it delivers the power of watt will be:
1.
2.
3.
4.

If is the velocity of light in free space, the correct statements about photons among the following are:

(A)	The energy of a photon is
(B)	The velocity of a photon is
(C)	The momentum of a photon,
(D)	In a photon-electron collision, both total energy and total momentum are conserved.
(E)	Photon possesses a positive electric charge.

Choose the correct answer from the options given below:

1.	(A), (B), (C) and (D) only
2.	(A), (C) and (D) only
3.	(A), (B), (D) and (E) only
4.	(A) and (B) only