The atomic masses of helium and neon are...

The atomic masses of helium and neon are 4.0 and 20.0 amu respectively. The value of the de Broglie wavelength of helium gas at `-73^(@)C` is M times the de Broglie wavelength of neon at `727^(@)C`. The value of M is

A

5

B

25

C

`(1)/(5)`

D

`(1)/(25)`

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