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A 124 W bulb converts only 15 % of the e...

A 124 W bulb converts only 15 % of the energy supplied to it into visible light of wavelength 640 nm . How many photons are emitted by the light bulb in one second ?

A

`4 xx 10^(19)`

B

`6 xx 10^(19)`

C

`8 xx 10^(18)`

D

`3 xx 10^(19)`

Text Solution

Verified by Experts

The correct Answer is:
B
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Knowledge Check

  • 6% of the energy supplied to a 100 watt lamp is radiated as visible light of wavelength 6620 Å. How many quanta are emiited per second ?

    A
    `10^(19)`
    B
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    B
    `2xx10^(28)`
    C
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    A
    `1.4` x `10^(18)`
    B
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