CUET · PHYSICS · PYQ PAPER 2023
In a photoelectric experiment, the wavelength of incident light is increased from \( 5 \times 10^{-10} \text{ m} \) to \( 9 \times 10^{-10} \text{ m} \), while the intensity of radiation remains the same. Choose the correct statement from the following.
- A The photoelectric current will decrease
- B The maximum kinetic energy of electron will increases
- C The intensity of radiation will increase
- D The cut off potential will decrease
Answer & Solution
Correct Answer
(D) The cut off potential will decrease
Step-by-step Solution
Detailed explanation
Energy of incident photon: \( E = \frac{hc}{\lambda} \) Maximum kinetic energy of electron: \( K_{max} = E - \phi \) Cut-off potential: \( eV_0 = K_{max} \) If wavelength (\(\lambda\)) increases, then photon energy (\(E\)) decreases. As \(E\) decreases, \(K_{max}\) decreases. As…
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