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Two source of light emit X - rays of ...

Two source of light emit X - rays of wavelenght 1 nm and visible light of wavelength 500 nm respectively . Both the source emit light of the same power 200 W. The ratio of the number density of photons of X - rays to the number density of photons of the visible light of the given wavelengths

A

`1/500`

B

250

C

`1/250`

D

500

Text Solution

Verified by Experts

The correct Answer is:
A
`P_(s)` = Power of source
`P_(s)= n (hc)/lambda `, n =Number of photons emitted /s
`rArr n prop lambda rArr (n_(2))/(n_(1)) =(lambda_(2))/(lambda_(1))=1//500`
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