The work function of a metal is 4.2 eV, its threshold wavelength – McqOptions

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1.	The work function of a metal is 4.2 eV, its threshold wavelength will be [BHU 2003; CPMT 2004]
A.	4000 Å
B.	3500 Å
C.	2955 Å
D.	2500 Å
Answer» D. 2500 Å

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