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If the velocity of hydrogen molecule is ...

If the velocity of hydrogen molecule is `5 xx 10^4 cm sec^-1`, then its de-Broglie wavelength is.

A

`2 Å`

B

`4 Å`

C

`8 Å`

D

`100 Å`

Text Solution

Verified by Experts

The correct Answer is:
B
(b) According to de-Broglie
`lamda = (h)/(mv) = (6.62 xx 10^-20 erg.sec)/((2)/(6.023 xx 10^23) xx 5 xx 10^4 cm//sec)`
=`(6.62 xx 10^-27 xx 6.023 xx 10^23)/(2 xx 5 xx 10^4) cm`
=`4 xx 10^-8 cm = 4 Å`.
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