AP EAMCET · PHYSICS · Dual Nature of Matter
Light of wavelength \(488 \mathrm{~nm}\) produced by an Agron laser is used in the photoelectric effect. When light from this spectral line is incident on the cathode, the stopping potential of the photoelectrons is \(0.38 \mathrm{~V}\). The work function of the cathode material is
- A \(2.16 \mathrm{eV}\)
- B \(216 \mathrm{eV}\)
- C \(21.6 \mathrm{eV}\)
- D \(0.216 \mathrm{eV}\)
Answer & Solution
Correct Answer
(A) \(2.16 \mathrm{eV}\)
Step-by-step Solution
Detailed explanation
Given, light of wavelength, \(\lambda=488 \mathrm{~nm}\) and stopping potential, of photoelectrons, \(V=0.38 \mathrm{~V}\) As, energy of photon \(E=\frac{h c}{\lambda}=\frac{1250}{488} \mathrm{eV}\) So, \(E=2.56 \mathrm{eV}\) \(\because\) Maximum kinetic energy of a…
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