1.

He^(+) ions are excited to respective first excited states. Subsequently, H-atoms transfer their total excitation Energy to Het jons collisions). Assume that the Bohr model of atom is exactly valid. The wavelength of light emitted in the visible region by He^(+) ions after collisions with H atoms is

Answer»

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

Solution :Now `E_(4)-E_(2)=(HC)/(LAMBDA)`
of `lambda=(E_(4)-E_(3))/(hc)`
Substitute the required values to GET
`lambda=4.8 xx 10^(7) m`.
It can be seen that the transition n=4 to n=3 gives light of visible region.


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