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Q.

The mass of an electron is 9.1x $10^{- 31}$ kg and its velocity is 812 ${ms}^{- 1}$ . Calculate its wavelength

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a

8.967 nm

b

896.7 nm

c

0.8967 m

d

89.67 nm

answer is C.

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Detailed Solution

$λ = \frac{h}{mv} = \frac{6.626 \times 10^{- 34} Js}{(9.1 \times 10^{- 31} kg) (812 {ms}^{- 1})}$

$= 8967 \times 10^{- 10} m$

= 896.7 nm

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The mass of an electron is 9.1x 10-31 kg and its velocity is 812 ms-1. Calculate its wavelength