CUET · PHYSICS · PYQ PAPER 2023
The work function of calcium is 2.14 eV. Find the threshold frequency for calcium.
- A \( 5.16 \times 10^{12} \text{ Hz} \)
- B \( 5.16 \times 10^{13} \text{ Hz} \)
- C \( 5.16 \times 10^{14} \text{ Hz} \)
- D \( 5.16 \times 10^{15} \text{ Hz} \)
Answer & Solution
Correct Answer
(C) \( 5.16 \times 10^{14} \text{ Hz} \)
Step-by-step Solution
Detailed explanation
\( f_0 = \frac{\phi}{h} \) \( f_0 = \frac{2.14 \times 1.602 \times 10^{-19} \text{ J}}{6.626 \times 10^{-34} \text{ J s}} \) \( f_0 = 5.16 \times 10^{14} \text{ Hz} \)
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