Question

A γ-ray photon is passing near a nucleus and breaks into an electron and positron. The region contains a uniform magnetic field B perpendicular to the plane of motion. Find the time after which they again converted into γ-ray. The force of electrostatic interaction and gravitational interaction may be neglected.

Options

• `(2pi"m")/"eB"`

• `(pi"m")/(2"eB")`

• `(4pi"m")/"eB"`

• None of these

Answer 1

`bb((2pi"m")/"eB")`