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The stopping potential for the photo-ele...

The stopping potential for the photo-electrons emitted from a metal surface of work-function 1.7 eV is 10.4 eV. 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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Knowledge Check

  • The stopping potential for the photoelectrons emitted from a metal surface of work function 1.7 eV is 10.4 eV. Identify the energy levels corresponding to the transitions in hydrogen atom which will result in emission of wavelength equal to that of incident radiation for the above photoelectric effect.

    A
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    B
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    D
    n = 4 to 1

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    A
    n= 3 to 1
    B
    n = 3 to 2
    C
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    D
    n =4 to 1

  • Five volt of stopping potential is needed for the photoelectrons emitted out of a surface of work function 2.2 eV by the radiation of wavelength

    A
    `1719A`
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    `3444A`
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