Darsh last edited by admin
answer is ACD
aditya last edited by
Harshal Patil last edited by
@darsh longest wavelength for H atom means 2–>1 transition wavelength.
So 1/λ=R(3/4) for H atom
also for He+ 1/λ=R(4)(1/4-1/n^2)
equate λ and you will get n=4. So any other value of n isnt possible except n=4