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Q.

Work function of a metal is 2.1 eV. Which of the waves of the following wavelengths will be able to emit photoelectrons from its surface?

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a

8000 $\overset{0}{A}$ , 6000 $\overset{0}{A}$

b

8500 $\overset{0}{A}$ , 6000 $\overset{0}{A}$

c

6000 $\overset{0}{A}$ , 7500 $\overset{0}{A}$

d

None of these

answer is D.

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Detailed Solution

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Threshold wavelength $λ_{o} = \frac{12375}{2 .1} = 5892 .8 \overset{0}{A}$

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