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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
According to de–Broglie
`lamda=h/(mv)=(6.62xx10^(-27)erg.sec)/(2/(6.022xx10^(23))xx5xx10^(4)cm//sec)`
= `(6.62xx10^(-27)xx6.022xx10^(23))/(2xx5xx10^(4))cm=4xx10^(-8)cm=4Å`.
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