QCE Physics Revision: UNITS 3 & 4
2026/2027 LATEST REVISION
QUESTIONS & CORRECT ANSWERS
GUARANTEED A+
What is the work function? - โโโ The minimum energy required to remove an
electron from the surface of a metal. (symbol, ๐; SI unit, J)
What is the weak nuclear force? - โโโ One of the four fundamental forces; the weak
nuclear force is responsible for radioactive decay and is mediated by W and Z bosons
What is the wave model of light? - โโโ The theory that light has the characteristics of
waves such as wavelength, frequency and speed. Used to describe the behaviour of
light such as interference and refraction.
What is uniform circular motion - โโโ The movement of an object at a constant speed
around a circle with a fixed radius
What is time dilation? - โโโ The difference of elapsed time between two events as
measured by observers moving relative to each other
What is the strong nuclear force? - โโโ One of the four fundamental forces; the
strong nuclear force acts over small distances in the nucleus to hold the nucleons
together against the repulsive electrostatic forces exerted between the protons; the
strong nuclear force is mediated by gluons
What is simultaneity? - โโโ The relation between two events assumed to happen at
the same time in a frame of reference
What is rest mass? - โโโ The mass of an object when measured in the same
reference frame as the observer
What is relativistic mass? - โโโ The increased mass of an object moving at high
speed
What is relativistic length? - โโโ The length measured in the frame of reference in
which the object is in motion
What is relativistic momentum? - โโโ The momentum of an object when measured in
the frame of reference in which the object is in motion?
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