How many photons per second emanate from a 50 mW laser of 640 nm ?

How many photons are emitted per second by a 5 mW laser operating at 620 nm ?

How many photons are emitted per second by a 5 mW laser source operating at 632.8 nm?

How many photons are emitted per second by a 5 m W laser source operating at 632.8nm?

How many photons are emitted per second by a 5 m W laser source operating at 632.8nm?

How many photons are emitted per second by a 5mW laser source operating at 632.8nm?

How many photons are emitted per second by a 5m W laser source operating at 632.8nm?

Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW. How many photons per second , on an average , arrive at a target irradiated by this beam ? (Assume the beam to have uniform cross-section which is less than the target area)