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1.

In problem 8 as mentioned above the wavelength of light emitted in the visibleregion by He^(+)ions after collisions with H atoms is

Answer»

`6.5 xx10^(-7)` m
`5.6 xx10^(-7)` m
`4.8 xx10^(-7)` m `4.0 XX 10^(-7)` m

ANSWER :C


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