A positively charged particle that consist of two protons and two neutrons and that is emitted from a nucleus during radioactive decaytrons, electrons and protons

An electron or positron that is emitted from a nucleus during radioactive decay

The high energy photon emitted by a nucleus during fission and radioactive decay

The process by which a nucleus splits into two or more fragments and releases neutrons and energy

The process in which light nuclei combine at extremely high temperatures forming heavier nuclei and releasing energy

The minimum mass of a fissionable isotope need to sustain a chain reaction

The time required for half of a sample of a radioactive isotope to break down by radioactive decay

An objects change in position relative to a reference point

The change in position of an object

The distance traveled divided by the time interval during which the motion occurred

The speed of an object in a particular direction

The rate at which velocity changes over time

An action exerted on a body in order to change the body’s state of rest or motion

A force that opposes motion between two surfaces

The tendency of an object to resist a change in motion 

A measure of the gravitational force exerted on an object

The constant velocity of a falling object when the force of air resistance is equal and opposite in direction to the force of gravity

The motion of a body when only the force of gravity is acting on the body

A quantity defined as the product of the mass and velocity of an object 

The curved path that an objects follows when thrown or launched

The transfer of energy to an object by the application of a force that causes the object to move in the direction of the force

A quantity that measures the rate at which work is done or energy is transformed

The capacity to do work

The energy that an object has because of the position, shape, or condition

The energy of an object due to the objects motion

The amount of work an object can do because of the kinetic and potential energies

A quantity expressed as a % that measure the ratio of useful work output to work input

A physical environment in which phenomena occur

The highest point of a wave

The lowest point of a wave

The maximum distance that the particles of a wave’s medium vibrate from their rest position

The distance from any point on a wave to the identical point on the next wave

The number of cycles or vibrations per unit of time

An observed change in the frequency of wave when the source or observer is moving

The bouncing back of a ray of light

A change in the direction of a wave when the wave finds an obstacle

The bending of a wave front as the wave passes between two substances

A wave that is caused by vibrations and that travel through a material medium

A measure of how high or low a sound is perceived to be

A system that uses acoustic signals and echoes to determine the location of objects or to communicate

A unit or quantity of light

The rate at which energy flows through a given area of space

A system that uses reflected radio waves to determine the velocity and location of objects

A line in space that matches the direction of the flow of radiant energy

The force of attraction or repulsion on a charged particle that is due to an electric field

A device that produces an electric current by converting chemical or radiant energy into electrical energy

The opposition presented to the current by a material or device

A circuit in which the parts are joined one after another such that the current in each part is the same

An electrical device that contains a metal strip that melts when current becomes to great

A set of electrical components connected such that they provide one or more paths for the movement of charges

One of two points, such as the ends of magnet, that have opposing magnetic qualities

A coil that has a soft iron core and that acts a magnetic when and electric current is in the coil

A region where a magnetic force can be detected

A coil of wire with an electric current in it

A machine that converts mechanical energy into electrical energy

A device that increases or decreases the voltage of alternating current

An electric current that changes direction at regular intervals