1.

Let E_(n)=(-1)/(8epsilon_(0)^(2)) (me^(4))/(n^(2)h^(2)) be the energy of the n^(th) level of H-atom. If all the H-atom are in the ground state and radiation of frequency (E_(2)-E_(1))//h falls on it,

Answer»

it will not be absorbed at all
some of atoms will MOVE to the first excited state
all atoms will be excited to the n=2 state
no atoms will make a transition to the n=3 state

Solution :Here, `E_(n)=(me^(4))/(8epsilon_(0)^(2)n^(2)h^(2))`
Is the energy of NTH level of hydrogen atom. If all the H-atom are in ground state, (n=1), then the radiation of frequency `(E_(2)-E_(1))//h` falling on it may not be absorbed by some of the atoms and move them to the first excited state (n=2). All atoms may not be excited to n=2 state. Further, as `(E_(2)-E_(1))//h` is sufficient only to TAKE the atom form n=1 state to n=2 state, no atoms shall make a transition to n=3 state. CHOICES (b) and (d) are correct.


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