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Lights metal...

Lights metal____

A

lithium

B

hydrogen

C

sodium

D

calcium

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Knowledge Check

  • Threshold wavelength of a metal for electron emission is 5200Å . Which one of the following sources of light will be able to emit electrons from the metal?

    A
    50 W infrared
    B
    1 W infrared
    C
    50 W red light
    D
    1 W ultraviolet

  • The work function of a metal surface is 2.0 eV. Light of wavelength 5000 Å is incident on it:

    A
    the energy of each incident photon is 2.48 eV
    B
    the threshold wavelength for photoelectric effect is `6200 Å`
    C
    maximum kinetic energy of emitted photoelectron is 0.48 eV
    D
    stopping potential is 0.48 eV

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    thresold Wavelength of incident light on a metal surface is 404 Å . Determine the work function.

    When light of wavelength 4041 Å falls on a metal surface, the maximum velocity of the emitted photoelectrons becomes twice the maximum velocity when another light of wavelength 5893 Å falls on the same surface. What is the photoelectric work function of that metal?

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