What wavelength photon is required to excite a hydrogen from the n=1 state to the n=3 state? what is the lowest frequency photon that will be observed?

Explanation:

It is given that,

Initial state of electron,

Final state of electron,

The wavelength of the excited electron is given by :

Where

R is Rydberg's constant

or

Let f is the frequency of the observed photon. It is given by :

Hence, this is the required solution.

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force