Question

The energy of the highest energy photon of Balmer series of hydrogen spectrum is close to.

• A. 13.6 eV
• B. 3.4 eV
• C. 1.5 eV
• D. 0.85 eV

Answer 1

Answer: (B)

3.4 eV

Answer 2

$E = 13.6\left\lbrack \frac{1}{n_{1}^{2}} - \frac{1}{n_{2}^{2}} \right\rbrack.$ For highest energy in Balmer series $n_{1} = 2$ and $n_{2} = \infty$⇒ $E = 13.6\left\lbrack \frac{1}{(2)^{2}} - \frac{1}{(\infty)^{2}} \right\rbrack = 3.4eV$.