Question

An electron is excited to fourth energy level in an atom. It will

Answer 1

Explanation:

ans. in fourth energy level -3.4eV

Answer 2

Answer:

Explanation:

Energy of an electron revolving in nth orbit of hydrogen like species is En=-2π^2Z^2me^4/n^2h^2

For H, Z=1 and putting other value except n, we get En=-13.6/n^2

As electron jumps from 4th energy level to ground state, the energy difference between 4th level and ground level will be -

E4-E1=-13.6(1/4^2–1/1^2) =12.75 ev/atom

Now, E=h√=hc/¥ (¥=lamda =wavelength)

¥=hc/E=6•626*10^-34 joule *3*10^8 m. S^-1/12.75*1.602*10^-5 joule

=9.73*10^-22 m