Calculate the wavelength, in nanometers, of the spectral line produced when an electron in a hydrogen atom undergoes the transition from the energy level =3n=3 to the level =1.

Explanation:

The expression for energy is -

For transitions:

Also,

Where,  

h is Plank's constant having value

c is the speed of light having value

So,  

So,  

Given,

1 m = 10⁻⁹ nm

diagram is missing, but i will try to explain your doubt.

answer:

amplitude is the maximum displacement or distance moved on a point of a vibrating body or wave measured from its equilibrium position.it is equal to half the length of vibration path.