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Standard XII

Physics

Energy Levels

An electron h...

Question

An electron has wavelength $1 A^{o}$ . The potential by which the electron is accelerated will be:

0.0926 V

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0.0502 V

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0.0826 V

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51.2 V

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Solution

The correct option is C $0.0826 V$
If electron is accelerated by V volt,
$K . E = e V = \frac{1}{2} m v^{2}$
$λ = \frac{h}{m v}$
$λ = \frac{h}{\sqrt{2 e V m}}; λ = 1 A^{o}$
On solving, $V = 0.0826 V$

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An electron has wavelength 1Ao. The potential by which the electron is accelerated will be:

The correct option is C 0.0826VIf electron is accelerated by V volt,K.E=eV=12mv2λ=hmvλ=h√2eVm;λ=1AoOn solving, V=0.0826V

An electron has wavelength $1 A^{o}$ . The potential by which the electron is accelerated will be:

The correct option is C $0.0826 V$
If electron is accelerated by V volt,
$K . E = e V = \frac{1}{2} m v^{2}$
$λ = \frac{h}{m v}$
$λ = \frac{h}{\sqrt{2 e V m}}; λ = 1 A^{o}$
On solving, $V = 0.0826 V$