Question

1. The work function of a photosensitive material is
4.0 eV. The longest wavelength of light that can
cause photon emission from the substance is
(approximately)
[NEET - 2019 (Odisha)]
(1) 310 nm
(2) 3100 nm
(3) 966 nm
(4) 31 nm​

Answer 1

Answer:

Mine answer is (1)

we can write ( hc = 1240nm) shortly for no calculation.

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