The speed of an electron having a wavelength of $10^{- 10} m$ is

4.24 \times 10^{6} m / s

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5.25 \times 10^{6} m / s

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6.26 \times 10^{6} m / s

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7.25 \times 10^{6} m / s

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Solution

The correct option is D $7.25 \times 10^{6} m / s$
We have
$λ = \frac{h}{p} = \frac{h}{m v}$
$\Rightarrow v = \frac{h}{m λ} = \frac{6.63 \times 10^{- 34}}{9.1 \times 10^{- 31} \times 10^{- 10}} = 7.25 \times 10^{6} m / s$

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The speed of an electron having a wavelength of 10−10m is

The correct option is D 7.25×106m/sWe haveλ=hp=hmv⇒v=hmλ=6.63×10−349.1×10−31×10−10=7.25×106m/s

The speed of an electron having a wavelength of $10^{- 10} m$ is

The correct option is D $7.25 \times 10^{6} m / s$
We have
$λ = \frac{h}{p} = \frac{h}{m v}$
$\Rightarrow v = \frac{h}{m λ} = \frac{6.63 \times 10^{- 34}}{9.1 \times 10^{- 31} \times 10^{- 10}} = 7.25 \times 10^{6} m / s$