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Dual Nature of Radiation and Matter question

2023 · Q136
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Dual Nature of Radiation and Matter question

2023 · Q136

NEETPhysicsDual Nature of Radiation and MatterMCQ+4 / −1

The work functions of Caesium (Cs)(\mathrm{Cs})(Cs), potassium (K)(\mathrm{K})(K) and Sodium (Na) are 2.14 eV,2.30 eV2.14 ~\mathrm{eV}, 2.30 ~\mathrm{eV}2.14 eV,2.30 eV and 2.75 eV2.75 ~\mathrm{eV}2.75 eV respectively. If incident electromagnetic radiation has an incident energy of 2.20 eV2.20 ~\mathrm{eV}2.20 eV, which of these photosensitive surfaces may emit photoelectrons?

  1. A
    Both Na and K
  2. B
    K only
  3. C
    Na only
  4. D
    Cs only
View written solutionFree

Correct answer: D

Given energy of photon $E=2.20 ~\mathrm{eV}$

Work function of $$\mathrm{Cs} ~\phi_{0}=2.14 ~\mathrm{eV}, \mathrm{K} ~\phi_{0}=2.30 ~\mathrm{eV}, \mathrm{Na} ~\phi_{0}=2.75 ~\mathrm{eV}$$

We know that $e^{-}$ emitts when $h v>\phi_{0}$

here it is clear that energy of photon is more than the work function of $\mathrm{Cs}$ [Caesium] only so Ans. only (Cs).

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