TS EAMCET · Physics · Dual Nature of Matter
Light of frequency \(4 \times 10^{14} \mathrm{~Hz}\) is incident on a metal surface of work function \(2.14 \mathrm{eV}\), resulting in photoemission of electrons. The maximum kinetic energy of the emitted electrons is \(\left[h=6.63 \times 10^{-34} \mathrm{~J}-\mathrm{s}\right.\) ]
- A \(0.35 \mathrm{eV}\)
- B \(0.14 \mathrm{eV}\)
- C \(2.14 \mathrm{eV}\)
- D \(0 \mathrm{eV}\)
Answer & Solution
Correct Answer
(D) \(0 \mathrm{eV}\)
Step-by-step Solution
Detailed explanation
Energy of a light photon, \(E=h f\) \[ \begin{aligned} & =6.63 \times 10^{-34} \times 4 \times 10^{24} \\ & =6.63 \times 4 \times 10^{-20} \mathrm{~J} \\ & =\frac{6.63 \times 4 \times 10^{-20}}{1.6 \times 10^{-29}} \mathrm{eV}=1.65 \mathrm{eV} \end{aligned} \] As, energy of…
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