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A 25 watt bulb emits monochromatic yello...

A 25 watt bulb emits monochromatic yellow light of wavelength of ` 0. 57 mu` m. Calculate the rate of emission of quanta per second .

A

`5.89 xx 10^15 sec^-1`

B

`7.28 xx 10^17 sec^-1`

C

`5 xx 10^(10)- sec^-1`

D

`7.18 xx 10^-19 sec^-1`

Text Solution

Verified by Experts

The correct Answer is:
D
(d) Let `n` quanta are evolved per sec
`n[(hc)/(lamda)] = 25 J sec^-1`
`n (6.626 xx 10^-34 xx 3 xx 10^8)/(0.57 xx 10^-6) = 25`.
`n= 7.18 xx 10^(-19)sec^(-1)`
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Knowledge Check

  • A 100 watt bulb emit monochromatic light of wavelength 400 nm.Calculate the number of photons emitted per second by the bulb.

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