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A helium atom at 300 K is moving with a ...

A helium atom at 300 K is moving with a velocity of `2.40 xx 10^(2) ms^(-1)`. The de-Broglie wavelength is about [At. Wt. of He=4.0]

A

`0.416nm`

B

` 0.83nm`

C

`803Å`

D

`8000Å`

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The correct Answer is:
A
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