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The threshold wavelength for a surface h...

The threshold wavelength for a surface having a threshold frequency of `0.6xx10^(15) Hz` is (given `c=3xx10^(8)m//s`)

A

`4000 A^(@)`

B

`6000 A^(@)`

C

`5000 A^(@)`

D

`3500 A^(@)`

Text Solution

Verified by Experts

The correct Answer is:
C
`lambda=c/v`
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Knowledge Check

  • The kinetic energy of the electron emitted when light of frequency 3.5 xx 10^15 H z falls on a metal surface having threshold frequency 1.5 xx 10^15 H z is (h = 6.6 xx 10^-34 Js) .

    A
    `1.32 xx 10^-18 J`
    B
    `3.3 xx 10^-18 J`
    C
    `6.6 xx 10^-19 J`
    D
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  • Calculate the wavelength of radio waves of frequency 10^(9) Hz . The speed of radio waves is 3 xx 10^(8)"m s"^(-1) .

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    B
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    10 cm

  • The effective mass of a photon with frequency 6.2 xx 10^15 Hz is

    A
    `4.25 xx 10^(-35)` kg
    B
    `45.4 xx 10^(-36)` kg
    C
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    D
    `6.9 xx 10^(-20)` kg

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