The atomic masses of He and Ne are 4 and...

The atomic masses of He and Ne are 4 and 20amu respectively. The value of the de-Broglie wavelength of He gas at `-73^(@)C` is 'M' times that of the de Broglie wave length of Ne at `727^(@)` the value of 'M' is

A

2

B

3

C

4

D

5

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