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A light source of wavelength 520nm emits...

A light source of wavelength 520nm emits `1.04 xx 10^(15)` photons per second while the second source of 460nm produces `1.38 xx 10^(15)` photons per second. Then the ratio of power of second source to that of first source is

A

`1.00`

B

`1.02`

C

`1.5`

D

`0.98`

Text Solution

Verified by Experts

The correct Answer is:
C
Power , `P = (E)/(t) = (nhu)/(t) = (n)/(t) xx (hc)/(lambda)`
`P_(1) = (1.04x 10^(5) xx 1240)/(520) = 2.48 xx 10^(15), P_(2) = (1.38 xx 10^(15) xx 1240)/(460) = 3.72 xx 10^(15)`
`(P_(2))/(P_(1)) = (3.72 xx 10^(15))/(2.48 xx 10^(15))= 1.5`
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