A hydrogne like atom is excited using a radiation . Consequently, six spectral line are observed in the spectrum. The wavelegth of emission radiation is found to be equal or smaller than the radiation used for excitation. This concludes that the gas was initially at

Options

A. Ground state
B. First excited state
C. Second excited state
D. Third excited state

Answer

C

Explanation

`(n_f(n_f -1)/(2)) = 6 rArr n_f = 4`
` From `n_i =2`, energy of six emission lines is either
greater than less or equal to the energy of
absorption line.