When an excited electron in a hydrogen atom falls from the n = 3 to the n = 2 level, a photon of red light is emitted from the atom. compared to the red photon, what would be true about the electromagnetic radiation emitted if an electron were to fall from n = 4 to n = 3?

653.33 nm ; 1875, 24 nm

Explanation: For the first case we have to use the Balmer series for  the hydrogen  when the atom falls from the n = 3 to the n = 2. So for the second transtions for the hydrogen we use  the Paschen serie.   To do  the calculation we need to know  the Ryberg constant that is equal to 1.097 * 10^7 m^-1. In the attach is shown the expression for spectral series used for calculation.

waves moving from a fast medium to a slow medium will experience a reflection as light travels more slowly than red light. total internal reflection occurs when the critical angle is.

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.