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The Work Function of a Certain Metal Is 1.90eV1.90 \mathrm { eV }

Question 3

Multiple Choice

The work function of a certain metal is 1.90eV1.90 \mathrm { eV } . What is the longest wavelength of light that can cause photoelectron emission from this metal? (1eV=1.60×1019 J,c=3.00×108 m/s,h=6.626×\left( 1 \mathrm { eV } = 1.60 \times 10 ^ { - 19 } \mathrm {~J} , c = 3.00 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } , h = 6.626 \times \right. 10>-34 J.s)


A) 14.0 nm14.0 \mathrm {~nm}
B) 62.4 nm62.4 \mathrm {~nm}
C) 654 nm654 \mathrm {~nm}
D) 231 nm231 \mathrm {~nm}
E) 344 nm344 \mathrm {~nm}

Correct Answer:

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