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A ultra violet light bulb, emitting 400 ...

A ultra violet light bulb, emitting 400 nm and infrared bulb emitting 700 nm wavelength radiation each are rated at 130 W. Then the ratio of the number of photons emitted per second by the UV & IR sources :-

A

0.57

B

1.75

C

28

D

0.04

Text Solution

Verified by Experts

The correct Answer is:
A
`n_(1)((hc)/(lambda_(1)))=n_(2)((hc)/(lambda_(2)))="power"=130W`
`n_(1)*n_(2)` number of photons emitted per second by UV & IR sources
`(n_(1))/(n_(2))=(lambda_(1))/(lambda_(2))=(400nm)/(700nm)=(4)/(7) =0.57`
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