The work function of a substance is 4.0 eV. The longest wavelength of – McqOptions

MCQOPTIONS

1.	The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately [IIT JEE 1998; UPSEAT 2002, 03; AIEEE 2004]
A.	540 nm
B.	400 nm
C.	310 nm
D.	220 nm
Answer» D. 220 nm

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