Fundamentholfundamenthol
NEET2026Physics
Q.

For a metal of work function 6.6 eV, which of the following wavelengths of incident radiation does not give rise to the photoelectric effect?

(Take Planck’s constant as J s)

  1. A

    200 nm

  2. B

    100 nm

  3. C

    50 nm

  4. D

    150 nm

Solution

Threshold wavelength is found from .

Using nm-V (or 12400 Å-V): Å Å nm.

The photoelectric effect occurs only if . Among the choices, 200 nm nm and thus fails to produce the photoelectric effect.

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