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photoelectron are emitted when 4000A^(0)...

photoelectron are emitted when `4000A^(0)` radiation is incident on a surface of work function `1.9eV`. these photoelectrons pass through a region has `alpha` particles to form `He^(+)` ion, emitting a single photon in this process `He^(+)` ions thus formed are in their fourth excited state.
Energy released during during the combination of `He^(+)` ions is

A

5.38 eV

B

3.38 eV

C

2.38 eV

D

1.38 eV

Text Solution

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The correct Answer is:
B
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Photoelectrons are emitted when 400 nm radiation is incident on a surface of work - function 1.9 eV. These photoelectrons pass through a region containing a-particles. A maximum energy electron combines with an a -particle to from a He^+ ion, emitting a single photon in this process. He^+ ions thus formed are in their fourth excited state. Find the energies in eV of the photons lying in the 2 to 4 eV range, that are likely to be emitted during and after the combination. [Take, h = 4.14xx10^(-15) eV -s]

photoelectrons are emited when 40 nm radiation is incident on a surface of work function 1.9 eV These photoelectron pass tjhrough a ragain cotaining a - particle A maximum energy electron conbines with an a - particle to from a He^(+) ion emitting a single photon in this process He^(+) ions thus formed are in their fourth excited state find the energies in eV of the photons typing is the 2 to 4 eV rage, that are likrly to be emitted during and after the combiution [Take h = 4014 xx 10^(-15) eV s]

Knowledge Check

  • phtoelectron are emitted when 4000A^(0) radiation is incident on a surface of work fuction 1.9eV . these photoelectrons pass through a region has a- particles to form He^(+) ion, emitting a single photon in this process He^(+) ions thus formed are in their fourth excited state. Energy released during during the combination of He^(+) ions is

    A
    `5.38eV`
    B
    `3.38eV`
    C
    `2.38eV`
    D
    `1.38eV`

  • photoelectron are emitted when 4000A^(0) radiation is incident on a surface of work fuction 1.9eV . these photoelectrons pass through a region has a- particles to form He^(+) ion, emitting a single photon in this process He^(+) ions thus formed are in their fourth excited state. Energy of the fourth excited state is approx

    A
    `-4.2eV`
    B
    `-2.2eV`
    C
    `-3.2eV`
    D
    `-1.2eV`

  • phtoelectron are emitted when 4000A^(0) radiation is incident on a surface of work fuction 1.9eV . these photoelectrons pass through a region has a- particles to form He^(+) ion, emitting a single photon in this process He^(+) ions thus formed are in their fourth excited state. Energy of emitted photon in range of 3eV & 4eV after combination is

    A
    `3.86eV`
    B
    `3.24eV`
    C
    `3.29eV`
    D
    `5.24eV`

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