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____________ is the change in velocity.
The _____ particle is a particle of radiation, composed of two protons and two neutrons, emitted by unstable nuclei.
A ________ is a tiny fragment such as a speck of dust.
_________ is the height of a wave crest or a wave trough of a transverse wave from the rest position.
The angle of __________ is the angle between the reflected ray and the normal.
Infrared _________ can transfer heat from the sun to Earth through the vacuum of space.
____ particles are high-energy electrons created in and emitted from unstable nuclei.
A black _____ is a cold star.
___________ force is the resultant force towards the centre of a circle acting on an object moving in a circular path.
The ciliary ______ controls the eye.
A _______ breaker cuts off the energy supply.
Heat energy travels through a solid from a hot region to a cold region by __________.
A _________ is a mterial that transfers energy.
____________ of momentum is a closed system.
Liquids and gases transfer heat by __________.
__________ lenses refract light.
A _____ is an electrical device that allows current flow in one direction only.
