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The stopping potential for the photoelec...

The stopping potential for the photoelectrons emitted from a metal surface of work function 1.7 eV is 10.4 V. Find the wavelength of the radiation used. Also, identify the energy levels in hydrogen atom which will emit this wavelength.

A

The wavelength of light used is `1022 Å`

B

The wavelength of light used is `970.6 Å`

C

The light used is emitted by hydrogen gas sample which de-excites from `n = 3` to `n = 1`

D

The light used is emitted by hydrogen gas sample which de-excites from `n = 3` to `n = 1`

Text Solution

Verified by Experts

The correct Answer is:
A, C
`K_(max) = 10.4 eV , phi = 1.7 eV`
`E = 10.4 + 1.7 = 12.1 eV rArr n = 3 ` to `n = 1`
`12.1 = (1242.eVÅ)/(lambda)`
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  • The work function of Cs is 2.14 ev find the wavelength of the incident light if the stopping potential is 0.6 V.

    A
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    B
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    C
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    D
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