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The work function of a substance is 4.0 ...

The work function of a substance is `4.0 eV`. The longest wavelength of light that can cause photo electron emission from this substance is approximately. (a) `540 nm` (b ) `400nm` (c ) `310 nm` (d) `220 nm`

A

540 nm

B

400 nm

C

310 nm

D

220 nm

Text Solution

Verified by Experts

The correct Answer is:
C
`lamda_(min)=(hc)/(omega)=(6.63xx10^(-34)xx3xx10^(8))/(4(1.6xx10^(-19)))=310xx10^(-9)`
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Knowledge Check

  • The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately

    A
    540 nm
    B
    400 nm
    C
    310 nm
    D
    220 nm

  • The work function of a substance is 4.0 eV The longest wavwlength of light that can cause photoelectron emission from this substance is approximately

    A
    `310 nm`
    B
    `400 nm`
    C
    `540 nm`
    D
    `220 nm`

  • The work function of a substance is 4.0 eV The longest wavwlength of light that can cause photoelectron emission from this substance is approximately

    A
    `540 nm`
    B
    `400 nm`
    C
    `310 nm`
    D
    `220 nm`

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