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Q.

The work function of sodium (Na) metal is 4.41 × 10-19J. If photons of wavelength 300 nm are incident on this metal, the kinetic energy (KE) of the ejected electrons will be (h =6.63 × 10-34 J s; c =3 × 108 m/s) _____ × 10-21 J.

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a

111

b

222

c

333

d

444

answer is B.

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Detailed Solution

KE=hcλ−W=6.63×10−34×3×108300×10−9−4.41×10−19=6.63×10−19−4.41×10−19=2.22×10−19=222×10−21J
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