Calculate the change in the energy of an electron that moves from the n = 3 level to the n = 2 level. what type of light is emitted?

Red light

Explanation:

The energy emitted during an electron transition in an atom of hydrogen is given by

where

is the energy of the lowest level

n1 and n2 are the numbers corresponding to the two levels

Here we have

n1 = 3

n2 = 2

So the energy of the emitted photon is

Converting into Joules,

And now we can find the wavelength of the emitted photon by using the equation

where h is the Planck constant and c is the speed of light. Solving for ,

And this wavelength corresponds to red light.

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