Light of wavelength \[\text{200 }\overset{\text{o}}{\mathop{\text{A}}} – McqOptions

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1.	Light of wavelength \[\text{200 }\overset{\text{o}}{\mathop{\text{A}}}\,\] fall on aluminum surface. Work function of aluminum is 4.2 eV. What is the kinetic energy of the fastest emitted photoelectrons?
A.	2eV
B.	1eV
C.	4eV
D.	0.2eV
Answer» B. 1eV

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