In a mixture of `He^(o+)` gas H atom and `He^(o+)` ions Are excited to three respective first excited subsepuenly , H atom transfers its total excitation energy to `He^(o+)`ions by collision .Assuming that Bohr model of an atom is applicable , answer the following question
When an electron of H jumps from a higher to lower energy state ,there

Options

A. Its potential energy decreases
B. Its kinetic energy increases
C. Its angular momentum remain unchanged
D. Wavelength of de Broglie wave associated with the electron decrease

Answer

A, B, C

Explanation

As electron from higher to orbit `En darr` hence `KREn uarr [KE = En]`
Similarly `Pen darr [Pen = 2En]`
Angular momentum `(L) = nh//2pi` hence `1 darr` as `n darr`
`lambda_(e) = h//mv_(n)[Ken uarr ` hence Vn darr]` therefore `lambda_(n) darr`