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Radiation of frequency 1.5 times the thr...

Radiation of frequency 1.5 times the threshold frequency is incident on a photosensitive material. If the frequency of incident radiation is halved and the intensity is doubled, the number of photoelectron ejected per second becomes:

A

Zero

B

half of its initial value

C

one fourth the initial value

D

three fourth the initial value

Text Solution

Verified by Experts

The correct Answer is:
A
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Knowledge Check

  • Light of frequency 1.5 times the threshold frequency is incident on a photo-sensitive material. If the frequency is halved and the intensity is doubled, the photoelectric current becomes

    A
    four times
    B
    double
    C
    half
    D
    zero

  • Light of frequency 1.5 times the htreshold frequency is incident on a photosensitive material. What will be the photoelevtric current if the frequency is halved and intensity is doubled?

    A
    Four times
    B
    One - fourth
    C
    Zero
    D
    Doubled

  • Assertion: Light of frequency 1.5 times the threshold frequency is incident on photo-senstive material. If the frequency is halved and intensity is doubled, the photo current remains unchanged. Reason: The photo electric current varies directely with the intensity of light and frequncy of light.

    A
    If both, Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
    B
    If both, Assertion and Reason are true but Reason is not a correct explanation of the Assertion.
    C
    If Assertion is true but the Reason is false.
    D
    If both Assertion and Reason are false.

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