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What is power (in watt) of a light sourc...

What is power (in watt) of a light source emitting `3.125 xx 10^(18)` photons per second, while the wavelength of light is `620 nm` ? (use `hc = 12400 eVÅ`)

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Verified by Experts

The correct Answer is:
`1`
Let the power be `x` wants.
No. of photons emitted per second `xx` Energy of `1` photon `=` Total energy
`:. 3.125 xx 10^(18) xx (12400)/(6200) = (x)/(1.6 xx 10^(-19)`
`:. x = 1`
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Knowledge Check

  • A laser emits a pulse of light with energy 5.0 xx 10^(3)J . Determine the number of photons in the pulse if the wavelength of light is 480 nm.

    A
    `5.2 xx 10^(16)`
    B
    `1.2 xx 10^(22)`
    C
    `2.5 xx 10^(19)`
    D
    `3.1 xx 10^(22)`

  • How many photons per second does a one watt bulb emit if its efficiency is 10% and the wavelength of light emitted is 500 nm

    A
    `6.52xx10^(17)`
    B
    `2.53xx10^(17)`
    C
    `5.321xx10^(11)`
    D
    `6.21xx10^(12)`
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