Threshold frequency for a metal is 10^ 15 ~Hz. Light of =4000 A f… - Vidyadip

MCQ

Threshold frequency for a metal is $10^{15} \mathrm{~Hz}$. Light of $\lambda=4000 \mathring A$ falls on its surface. Which of the following statements is correct?

✓
No photoelectric emission takes place.
B
Photoelectrons come out with $10^5 \mathrm{~m} / \mathrm{s}$ speed.
C
Photoelectrons come out with zero speed.
D
Photoelectrons come out with $10^3 \mathrm{~m} / \mathrm{s}$ speed.

✓

Answer

Correct option: A.

No photoelectric emission takes place.

A

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