Question

Q.7
The energy of electron in first Bohr's orbit of H-
atom is -13.6 eV. What will be its potential
energy in n = 4th orbit -
(A) - 13.6 eV (B) -3.4 eV
(C) -0.85 eV (D) -1.70 eV
Q.8
The frequency of line spectrum of sodium is
5.09 x 10^14 sec. Its wave length (in nm) will
be (c = 3 x 10^8 m/sec)
(A) 510 nm
(B) 420 nm
(C) 589 nm
(D) 622 nm
​

Answer 1

Que8:-

answer:-(C).....