What is pair production?

What is the threshold energy for electron-positron pair production?

Why must pair production occur near a nucleus or another particle?

Can a \(0.900\,\mathrm{MeV}\) photon produce an electron-positron pair?

Can a \(1.50\,\mathrm{MeV}\) photon produce an electron-positron pair near a nucleus?

Ignoring recoil, how much total kinetic energy is available from a \(2.50\,\mathrm{MeV}\) photon after electron-positron pair production?

Ignoring recoil, a pair has total kinetic energy \(0.800\,\mathrm{MeV}\). What was the photon energy?

Find the maximum wavelength photon that can produce an electron-positron pair. Use \(hc=1240\,\mathrm{eV\,nm}\).

What is pair annihilation?

When an electron and positron annihilate at rest, what photon energies are usually produced?

Why are two photons produced in electron-positron annihilation at rest rather than one?

Write the approximate energy balance for pair production near threshold, including recoil.

A photon has energy \(1.022\,\mathrm{MeV}\). What kinetic energy is available exactly at threshold?

Why is pair production evidence for mass-energy equivalence?

What happens to the charge in electron-positron pair production?

A \(4.00\,\mathrm{MeV}\) photon produces an electron-positron pair. Ignoring recoil, estimate the kinetic energy available to the pair.

If the kinetic energy is shared equally in question 16, estimate each particle's kinetic energy.

Why does pair production require high-energy photons such as gamma rays?

Derive the electron-positron pair production threshold.

A photon has wavelength \(2.0\,\mathrm{pm}\). Can it produce an electron-positron pair? Use \(hc=1240\,\mathrm{eV\,nm}\).