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Light of wavelength A which is less than...

Light of wavelength A which is less than threshold wavelength is incident on a photosensitive material. If incident wavelength is decreased so that emitted photoelectrons are moving with same velocity, then stopping potential will

A

increase

B

decrease

C

be zero

D

become exactly half

Text Solution

Verified by Experts

The correct Answer is:
A
According to photoelectric equation, `(hc)/(lamda)=phi+E`
If E is constant, then
`(1)/(lamda)prop phi`
If we decrease the wavelength `lamd`, then stopping potential `phi` will increase such that `(hc)/(lamda)-phi`=constant.
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Knowledge Check

  • When wavelength of incident photon is decreased then

    A
    Velocity of emitted photo - electron decreases
    B
    Velocity of emitted photo - electron increases
    C
    Velocity of photo-electron do not change
    D
    Photo electric current increases

  • If the wavelength of incident light decrease from lamda _ 1 to lamda _ 2 in photoelctric cell then corresponding chages in stopping potential will be

    A
    an increase of ` (hc//e ) ( 1//lamda _ 2 - 1 //lamda _ 1 ) `
    B
    a decrease of ` (hc//e)(1//lamda _ 2 - 1 //lamda _ 1)`
    C
    an increase of `(hc) (1//lamda _ 2 - 1//lamda _ 1 )`
    D
    a decrease of (hc) ` (1//lamda _2 - 1 //lamda _ 1 ) `

  • Light of wavelength 200 nm incident on a metal surface of threshold wavelength 400 nm kinetic energy of fastest photoelectron will be

    A
    `3.1 eV`
    B
    `4.5 eV`
    C
    `6.2 eV`
    D
    `7.2 eV`

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