D: neutrino
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An unstable nucleus of an element decays by emitting an α-particle or a β⁻ particle to become a nucleus of a differen…
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.
A source of sound waves with constant frequency moves towards a stationary observer. The observer compares the sound …
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…