Light shines through atomic hydrogen gas.It is seen that the gas absorbs light readily at a wavelength of 91.33 nm.What is the level to which the hydrogen is being excited by the absorption of light of this wavelength? Assume that the most of the atoms in the gas are in the lowest level.
A)25
B)27
C)22
D)32

Question

Quizplus · Accepted Answer

The energy of a photon is given by E = hc/λ, where h is Planck's constant, c is the speed of light, and λ is the wavelength. The energy of a photon with a wavelength of 91.33 nm is 13.6 eV. This is the energy difference between the ground state and the first excited state of hydrogen. Therefore, the hydrogen is being excited to the first excited state by the absorption of light of this wavelength.

Light Shines Through Atomic Hydrogen Gas