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# E+M Warmups

Physics is not a discipline, but a way of looking at the world. See if you can use your sense of the world to explain everyday phenomena.

Find the wavelength of the photon that radiates when an electron jumps from the \(n = 3\) energy level down to the \(n = 2\) energy level. Where is this photon in the electromagnetic spectrum?

**Assumptions**

- \(h\) (Planck's constant) = \(4.14 \times 10^-15\) eV s.
- \(c\) (Speed of light) = \(3 \times 10^8\) m/s.
- All values are approximate.
- Assume that this is a hydrogen atom.

Note: \(\epsilon_0 \) in the choices below denotes the electric constant.

It then gets retarded through \(19 \text{ V}\) and has a wavelength of \(x_2\).

A final retardation through \(32 \text{ V}\) changes the wavelength to \(x_3\).

What is \(\displaystyle\frac{x_3-x_2}{x_1}\) as a percentage?

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