A nucleus of ²³⁸₉₂U decays in stages by emitting α-particles and β⁻ particles, eventually forming a nucleus of ²⁰⁶₈₂Pb. How many α-particles and how many β⁻ particles are emitted during the decay chain?

A stationary nucleus has nucleon number A. The nucleus decays by emitting a proton with speed v to form a new nucleus…

An isolated stationary nucleus Q decays into nucleus R and an α-particle. The α-particle has speed 1.5 x 10⁷ms⁻¹.

The following represents a sequence of radioactive decays involving two α-particles and one β-particle. ²¹⁷₈₅At → α →…

Which type of waves cannot be polarised?

A beam of light with power P has an area of cross-section A. The amplitude of the light waves in the beam is X. The b…

Two wave sources emit coherent waves. Which condition must be correct for the coherent waves?