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An electric bulb of 100 W converts 3% of...

An electric bulb of 100 W converts 3% of electrical energy into light energy.If the wavelength of light emitted is 6625 Å,the number of photons emitted in 1 s is………..
`(h=6.625xx10^(-34))JS`

A

`10^(17)`

B

`10^(19)`

C

`10^(21)`

D

`10^(15)`

Text Solution

Verified by Experts

The correct Answer is:
B
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Knowledge Check

  • Frequency of photon having 66 eV energy will be…… (h=6.6xx10^(-34)Js)

    A
    `8xx10^(-15)Hz`
    B
    `12xx10^(-15)Hz`
    C
    `16xx10^(-15)Hz`
    D
    `24xx10^(-15)Hz`

  • The threshold wavelength of Na element is 6800 Å.Its work function is ………. xx10^(-19)J.(h=6.625xx10^(-34)Js,C=3xx10^(8)ms^(-1))

    A
    2.9
    B
    2.7
    C
    2.8
    D
    3

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