Question

Which of the following transitions of an electron in hydrogen atom emits radiation of the lowest wavelength?

• A. $n_2=\infty$ to $n_1=2$
• B. $n_2=4$ to $n_1=3$
• C. $n_2=2$ to $n_1=1$
• D. $n_2=5$ to $n_1=3$

Answer 1

The correct option is A $n_2=\infty$ to $n_1=2$

The transition $n_2=\infty$ to $n_1=2$ emits radiation of the lowest wavelength. This transition corresponds to maximum energy of emitted radiation. It is equal to the ionization energy and corresponds to the energy required when an electron is completely removed from ground state of hydrogen atom.