Question

The ionisation potential of H-atom is 13.6 V. When it is excited from ground state by monochromatic radiations of 970.6Å, the number of emission lines will be (according to Bohr's theory)-

• A. 10
• B. 8
• C. 6
• D. 4

Answer 1

Answer: (C)

6

Answer 2

l_ph = 970.6Å

E_ph = $\frac{12400}{\lambda_{ph}(Å)}$eV = $\frac{12400}{970.6}$eV