JEE Mains · Physics · STD 12 - 11. Dual nature of radiation and matter
A light wave described by \(E =60 \sin \left(3 \times 10^{15}\right) t + \sin \left(12 \times 10^{15}\right)\) t] (in SI units) falls on a metal surface of work function 2.8 eV . The maximum kinetic energy of ejected photoelectron is (approximately) _________ eV .
- A 5.1
- B 3.8
- C 6
- D 7.8
Answer & Solution
Correct Answer
(A) 5.1
Step-by-step Solution
Detailed explanation
\(\omega_1=3 \times 10^{15} rad / sec\) \(\omega_2=12 \times 10^{15} rad / sec\) \(\because \quad v=\frac{\omega}{2 \pi}\) \(E_{\text {photon }}=h v=6.6 \times 10^{-34} \times 1.91 \times 10^{15}\) \(=1.26 \times 10^{-18} J\)…
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