1.

In a hydrogen like specieselectrons is in 2^(nd)excited statethe binding energy of the fourth state of this species is 13.6 eV then

Answer»

A 25 eV PHOTON can set free the electron from the secondexcited stateof thissample
twodifferent TYPES of photon will be observed if electron make TRANSITION up to groun state from the second excite state
if 23 eV photon is used for electron in `2^(nd)`excited statye then KE of the ejected electron is 1 eV
`2^(nd)`lineof balmer series of this samplehas same energy value as `1^(st)`excitation energy of HYDROGEN atoms

ANSWER :A


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