Q 1313145049.     A `100` W power source emits green light at a wavelength `lambda=5000 overset{ circ}{A}`. How many photons per minute are emitted by the source?

A

`1.5 times 10^{22}`

B

`2 times 10^{21}`

C

`3 times 10^{24}`

D

`2.5 times 10^{21}`

HINT

Use formula: the number of photons `(n) ` emitted in time `t` sec is given by `n = frac{P t lambda}{h c}`

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