Science Quiz / A2 Physics Definitions

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Can you name the A2 Physics Definitions

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HintAnswer
The acceleration of a body moving in a circle with constant speed acting towards the centre of the circle.
The property of a material that determines the intensity of ultrasound refracted at a boundary with another material.
Unit of magnetic flux density. 1 _ is the magnetic flux density that will produce a force a force of 1N on 1m of wire carrying a current of 1A perpendicular to the direction of the
Unit of magnetic flux. 1 _ is the flux when a magnetic flux density of 1T passes through an area of 1m^2 at right angles
The rate of change of the momentum of an object is directly proportional to the resultant force acting upon it and the change in momentum is in the same direction as the force.
The _ _ _ at any point is the force acting per unit mass at that point.
The change in wavelength caused by the relative motion between the wave source and an observer.
The use of gamma photons produced when positrons annihilate with electrons inside the body to map out active areas within the body.
Unit of capacitance.
The time taken for the charge remaining on a capacitor to fall to 1/e of its original value.
The situation if the mean density of the universe is equal to the critical density. The galaxies in the universe will slow down but never quite stop.
A device that has a greater number of wire turns on the output side than the input side and so increases the emf and reduces the electric current on the output side.
When the acceleration of an object is proportional to its displacement and the acceleration is in the opposite direction to the displacement.
A constant giving the number of particles in 1 mol of a substance.
The energy required to raise the temperature of 1kg of a substnace of 1K.
A device that converts a non-electrical signal into an electrical signal.
A gas that has internal energy only in the form of random kinetic energy.
The product of magnetic flux density and the area at right angles to the flux.
Two stars in orbit around their common centre of gravity.
The direction of any induced current is in a direction that opposes the flux change that causes it.
Physical law stating that in the absence of external forces the total momentum of a system remains constant.
A constant used to calculate intensity of x-rays as they pass through a material.
A region of space where a charged particle experiences a force.
The period of a planet orbiting the sun squared is proportional to the mean radius of its orbit cubed.
The process when a particle and antiparticle interact and their combined mass is converted to energy.
The force that is responsible for beta decay. It occurs between leptons during hadron decay.
The volume of a fixed mass of gas is inversely proportional to pressure exerted on it, provided temperature remains constant.
The average density of the universe above which the universe will collapse, and below which the universe will expand forever.
The apparent increase in wavelength caused when luminous objects move away from the observer.
HintAnswer
The process of matching up materials with similar acoustic impedances to allow good transmission of ultrasound through the materials.
A force applied at regular intervals in order to keep an object oscillating.
On a large scale the universe is uniform.
The charge stored per unit potential difference.
A particle of antimatter that has the same rest mass but, if charged, the equal opposite charge to its corresponding particle.
The sum of all the kinetic and potential energies of molecules within a substance.
The energy required to separate an atom into its component parts.
A property of baryons and quarks that is conserved in particle interactions.
When body A exerts a force on body B, body B exerts an equal and opposite force on body A.
The process of inducing an emf using a magnetic field and a changing flux linkage.
Sound waves above the audible range of human hearing.
The average distance from the Earth to the Sun.
The process of slitting a large nucleus into two smaller nuclides, often with the emission of several neutrons,
The magnitude of the induced emf is equal to the rate of change of flux linkage.
The frequency of the free oscillations of a sytems,
The effect whereby x-rays deflected off particles have a longer wavelength than their initial wavelength.
A particle that has a charge due to loss or gain of an electron.
The theory that the universe was created out of nothing from a single point. The universe was once much smaller, hotter and denser.
The number of radioactive decays per unit time.
The damping of an oscillating system when the forces cause the system to return to the equilibrium position without oscillating.
The situation if the mean density of the universe is greater than the critical density. The universe will collapse back into a single point.
The random movement of small particles when suspended in a liquid or gas.
The force between nucleons that holds the nucleus together.
Unit of activity
When an object travels along a circular path.
In a _ _ kinetic energy and momentum are conserved.
The force between two charges is proportional to the product of the charges and inversely proportional to the square of the distance between them.
The movement of a spinning object caused by the effect of a torque leading to a change in the direction of its axis of rotation.
The situation if the mean density of the universe is less than the critical density.
HintAnswer
The process of creating a particle-antiparticle pair from a high-energy photon.
The use of powerful magnetic fields and the spin of hydrogen atoms within the body to produce a detailed image of the internal organs.
The radioactive decay that causes emission of a beta particle and an antineutrino from the nucleus when a neutron breaks down into a proton under the influence of the weak nuclear
The average time taken for the activity of a radioactive source to decrease to one half of its original value.
A process using x-rays in 3D and computers in order to produce an image of a slice through the body.
A particle consisting of three quarks.
The frequency of precession of a proton in a magnetic field.
An orbit of the Earth made by a satellite that has the same time period as the rotation of the Earth, and is in the equatorial plane.
A device that has a greater number of wire turns on the input side than the output side and so reduces the emf and increases the electric current on the output side.
When the driving frequency is equal to the natural frequency of an oscillating system. This causes a dramatic increase in the amplitude of the oscillations.
The distance in a medium over which x-ray intensity is attenuated to half its original value.
The change in volume of certain crystals when a pd is applied across them.
A detector of gamma photons emitted from a patient given a radioactive tracer.
The process of two nuclei joining together and releasing energy from a change in binding energy.
The frequency of the driving force applied to an oscillating object.
The energy required to change the state of 1kg of a substance at its melting point from solid to liquid.
A body comprising mainly ice and rock in orbit around a star.
Force per unit positive charge.
A collision where momentum is conserved but kinetic energy is not.
The gravitational force of the attraction between two bodies is directly proportional to the product of their masses and inversely proportional to the square of the distance betwee
A region of space where a magnetic pole experiences a force.
The speed of recession of a galaxy is directly proportional to its distance from the Earth.
The resultant force on an object, acting towards the centre of the circle causing it to move in a circular path.
The energy required to change the state of 1kg of a substance at its boiling point from liquid to gas.
The probability of radioactive decay.
A measure of the strength of the magnetic field.
The process of adding or removing an electron from an atom.
An object will remain at rest or continue travelling at a constant velocity unless acted upon by a force.
The product if the magnetic flux and the number of turns on the coil it passes through.

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