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Standard XII

Physics

Threshold Frequency

The work func...

Question

The work function for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einstein’s equation, the metals which will emit photo electrons for a radiation of wavelength $4100 \circ A$ is/are

None of these

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A only

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A and B only

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All the three metals

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Solution

The correct option is C
A and B only

Energy of incident radiations (in eV) $= \frac{12375}{4100} = 3.01 e V$
Work function of metal A and B are less then 3.01eV, so A and B will emit photo electrons.

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The work function for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einstein’s equation, the metals which will emit photo electrons for a radiation of wavelength 4100 ∘A is/are

The correct option is C A and B only Energy of incident radiations (in eV) =123754100=3.01 eV Work function of metal A and B are less then 3.01eV, so A and B will emit photo electrons.

The work function for metals A, B and C are respectively 1.92 eV, 2.0 eV and 5 eV. According to Einstein’s equation, the metals which will emit photo electrons for a radiation of wavelength $4100 \circ A$ is/are

The correct option is C
A and B only

Energy of incident radiations (in eV) $= \frac{12375}{4100} = 3.01 e V$
Work function of metal A and B are less then 3.01eV, so A and B will emit photo electrons.