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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
`lambda=h/"mv"=(6.62xx10^(-27) erg.sec)/(2/(6.023xx10^23))xx5xx10^4"cm/sec"`
`=(6.62xx10^(-27)xx6.023xx10^23) /(2xx5xx10^4) cm = 4xx10^(-8) cm=4Å`
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