AP EAMCET · PHYSICS · Dual Nature of Matter
If ultraviolet radiation of \(6.2 \mathrm{eV}\) falls of an aluminium surface, then kinetic energy of the fastest emitted electron is (work-function \(=4.2 \mathrm{eV}\) )
- A \(3.2 \times 10^{-19} \mathrm{~J}\)
- B \(32 \times 10^{-21} \mathrm{~J}\)
- C \(7 \times 10^{-25} \mathrm{~J}\)
- D \(9 \times 10^{-31} \mathrm{~J}\)
Answer & Solution
Correct Answer
(A) \(3.2 \times 10^{-19} \mathrm{~J}\)
Step-by-step Solution
Detailed explanation
Energy of ultraviolet radiation, \(E=6.2 \mathrm{eV}\) Work-function, \(\phi=4.2 \mathrm{eV}\) \(\therefore\) According to Einstein's photoelectric equation, kinetic energy of the fastest emitted electron,…
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