Question

1. A physical process that particle and antiparticale are materialized from energy or gamma-rays

2. In quantum mechanics, a quantum state of a partide is determined by a set of_______.

Answer 1

1. A physical process that particle and antiparticle are materialized from energy or gamma rays is called pair -production.

Ex - When a photon approaches near nucleus of atom it gets converted into positron and electron. Positron has same mass as of electron but has positive charge.

2. In quantum mechanics, a quantum state of a particle is completely defined by a set of commuting observables.

Since commuting variables can be measured simultaneously without affecting the measurement of other commuting observables.