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Caesium has work function 2.14 eV. Its threshold frequency is about what?
A2.1 × 10¹⁵ Hz
B5.2 × 10¹⁴ Hz
C3.2 × 10¹⁴ Hz
D8.0 × 10¹⁴ Hz
Answer & Solution
Correct answer: B. 5.2 × 10¹⁴ Hz
ν0 = φ0/h = (2.14 × 1.6 × 10⁻¹⁹ J)/(6.63 × 10⁻³⁴ J s), which is about 5.2 × 10¹⁴ Hz.
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