Chemistry

Problem

Energy of an electron is given by

E = -2.178 \times 10^{-18} \text{ J} \left( \frac{Z^2}{n^2} \right)

. Wavelength of light required to excite an electron in a hydrogen atom from level

n=1

n=2

will be :

(h = 6.62 \times 10^{-34} \text{ Js and } c = 3.0 \times 10^8 \text{ ms}^{-1})

6.500 \times 10^{-7} \text{ m}

8.500 \times 10^{-7} \text{ m}

1.214 \times 10^{-7} \text{ m}

2.816 \times 10^{-7} \text{ m}