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-- 3. The radiation emitted when an electron jumps from n = 3 to n = 1 orbit in hydrogen atom falls on a metal to produce photoelectrons. If the work function of the metal is 1.08 eV, then stopping potential will be
A
10 V
B
9 V
C
11 V
D
12 V
Explanation
Energy emitted E = 13.6 * (1/1² - 1/3²) = 13.6 * (8/9) ≈ 12.09 eV. K_max = E - Φ = 12.09 - 1.08 = 11.01 eV. Therefore, stopping potential V_s = 11 V.
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