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Q.

Kinetic energy of photo electron emitted is 9.1 x 10^-21 J. Velocity of photo electron emitted is --------- m/sec ( mass of electron = 9.1 x 10^-28 gms)

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a

2 x 10⁵

b

1.414 x 10⁵

c

1.414 x 10¹⁰

d

1.414 x 10^-5

answer is B.

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Detailed Solution

velocity of photo electron = $\sqrt{\frac{2 KE}{m_{e^{-}}}}$

= $\sqrt{\frac{2 \times 9.1 \times 10^{- 21}}{9.1 \times 10^{- 31}}}$

=1.414 x 10⁵

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