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De Broglie's Hypothesis

Velocity of t...

Question

Velocity of the electron in electron microscope is $1.6 \times 106 m / s e c$ . What would be the wavelength of the electron?

A

5.39 A^{\circ}

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B

4.55 A^{\circ}

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C

3.54 A^{\circ}

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D

6.78 A^{\circ}

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Solution

The correct option is B $4.55 A^{\circ}$
$λ = \frac{h}{m ν} . . .$ de- Broglie concept
$∴ λ = \frac{h}{m \times 1.6 \times 10^{6}} \Rightarrow λ = 4.55 \times 10^{- 10} m$
$= 4.55 A °$

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