The incident photon involved in the photoelectric effect experiment.

  • A

    Completely disappears

  • B

    Comes out with an increased frequency

  • C

    Comes out with a decreased frequency

  • D

    Comes out without change in frequency

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  • [AIPMT 1991]

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$(b)$ How many photons per second, on an average, are emitted by the source?

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