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Find energy of photons which corresponds...

Find energy of photons which corresponds to light of frequency `3 xx 10^(12) Hz`

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Knowledge Check

  • When a certain metal was irradiated with light of frequency 3.2 xx 10^(16) Hz, the photoelectrons emitted had twice the kinetic energy as did photoelectrons when the same metal was irradiated with light of frequency 2.0 xx 10^(16) Hz . The threshold frequency for the metal is

    A
    `1.2 xx 10^(16) Hz`
    B
    `8s xx 10^(15) Hz`
    C
    `8 xx 10^(16) Hz`
    D
    `1.2 xx 10^(15) Hz`

  • When a certain metal was irradiated with light of frequency 40xx10^(16) s^(-1) , the photoelectrons emitted had four times kinetic energy as the kinetic energy of photoelectrons emitted when the same metal was irradiated with light of frequency 2.0 xx 10^(16) s^(-1) . the trhreshold frequency ( v_(0) ) of the metal in s^(-1) is

    A
    `2xx10^(16)`
    B
    `4 xx 10^(16)`
    C
    `2.5 xx 10^(16)`
    D
    `1.33 xx 10^(16)`

  • A light of frequency 1.6xx10^(16) Hz when falls on a metal plate emits electrons that have double the kinetic energy compared to the kinetic energy of emitted electrons when frequency of 1.0xx10^(16) Hz falls on the same plate. The threshold frequency (lamda_(0)) of the metal in Hz is

    A
    `1xx10^(15)`
    B
    `4xx10^(15)`
    C
    `3xx10^(15)`
    D
    `4xx10^(13)`