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Q.

A 50 watt bulb emits monochromatic red light of wavelength of 795nm. The number of photons emitted per second by the bulb is X×1020.  The value of x is__________
[Given, h=6.63×10−34Js and  c=3.0×108ms−1]

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a

2

b

1

c

6

d

4

answer is B.

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Detailed Solution

E=nhcλ
50=n×6.625×10−34×3×108795×10−9
n=2×1020
x=2

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