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10^-3 W of 5000A light is directed on a ...

`10^-3` W of `5000A` light is directed on a photoelectric cell. If the current in the cell is `0.16muA`, the percentage of incident photons which produce photoelectrons, is

A

`0.4%`

B

`.04%`

C

`20%`

D

`10%`

Text Solution

Verified by Experts

The correct Answer is:
B
(a) `P= (overset(.)(N)hc)/(lambda)` (b) `i=overset(.)(n) e` (c) `%=overset(.)(n)/(overset(.)(N))xx100%`
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Knowledge Check

  • 10^(-3) W of 5000 Å light is directed on a photoelectric cell. If the current in the cell is 0.16 mA, the percentage of incident photons which produce photoelectrons, is

    A
    0.004
    B
    0.0004
    C
    0.2
    D
    0.1

  • A 100 W point source emits monochromatic light of wavelength 6000 A Q. 1.5 mW of 4000A light is directed at a photoelectric cell If 0.10 per cent of the incident photons produce photoelectrons, find current is the cell. [Given h=6.6xx10^(-34)Js , c=3xx10^(8)ms^(-1) and e=1.6xx10^(-19)C ]

    A
    `0.59muA`
    B
    `1.16 muA`
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  • A beam of light of wavelength 400nm and power 1.55 mW is directed at the cathode of a photoelectric cell. If only 10% of the incident photons effectively produce photoelectrons, then find current due to these electrons. (given hc=1240 eV-nm, e=1.6xx10^(-19)C )

    A
    `5 muA`
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