<human>:  When a gamma ray hits a nucleus, what happens?
<bot>: The gamma ray will cause the nucleus to emit a particle of light, which is called a photon. The photon will then have a specific energy, which is called its energy, and will have a specific wavelength, which is called its wavelength. The energy and wavelength of the photon are related to each other by the relationship E = hν, where E is the energy of the photon, h is Planck’s constant, and ν is the frequency of the photon.