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Q.

A radiation of wave length 3000A0 is required to remove an electron from a metal atom.  If a radiation of wave length 2000A0 is allowed to incident on the metal surface, the kinetic energy of the emitted electron in kJ/mole is

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a

1.98×102

b

3.3×10−19

c

3.3×10−20

d

19.8

answer is A.

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Detailed Solution

hcλ=hcλ0+K.E K.E=hcλ−hcλ0           =hc[1λ−1λ0]                       =6.6×10−34×3×108(12000×10−10−13000×10−10) =3.3x10-21 =3.3x10-21x 6.023x1023K.E=1.98×102 KJ/mole
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