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Physics · 2025 · 2 marks
Dual Nature of Radiation and MatterEinstein’s Photoelectric Equation: Energy Quantum of Radiation2 marksApplyvery short answer
CBSE 2025 · Region 5 · Set 1 · Q17
The threshold frequency for a given metal is 3.6 × 10^14 Hz. If monochromatic radiations of frequency 6.8 × 10^14 Hz are incident on this metal, find…
The threshold frequency for a given metal is $\displaystyle 3.6 \times 10^{14} \mathrm{~Hz}$. If monochromatic radiations of frequency $\displaystyle 6.8 \times 10^{14} \mathrm{~Hz}$ are incident on this metal, find the cut-off potential for the photoelectrons.
Marking-scheme solution
$\displaystyle e V_{0}=h\left(\nu-\nu_{0}\right)$
$\displaystyle V_{0}=\frac{6.63 \times 10^{-34} \times(6.8-3.6) \times 10^{14}}{1.6 \times 10^{-19}}$
$\displaystyle =1.33 \mathrm{~V}$
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