Physical Science chapter 4

__ of an electric current through a wire occurs as an electron travels a short distance and then repels another electron.

__ rays are high energy rays which can cause skin cancer

is a measurement of the rate of current flow

light usually travels more rapidly through a __ than a solid or liquid

when the temperature is high, the resistance to the flow of electricity would probably be __

__ is associated with Mr. Roy G. Biv

__ wavelengths of light have a higher frequency

__ rays are heat rays, they have a frequency slightly lower than visible light

an __ is uncharged, but it contains electrons and protons, which are charged particles

ultrasonic waves occur at frequencies __ than our ears can hear

two negative charges will __ each other

__ effect involves a decrease in the frequency of sound or light as the source moves away from us.

sound usually travels more rapidly through a __ than a liquid and gas

a __ circuit has only one path for the electric current to follow

the path through which an electrical current flows

a __ is a unit used to measure the potential difference between two points in a circuit

__ electricity flows from one place to another in a circuit

the distance between successive disturbances of the same types (from one wave crest to another)

__ from the sun travels fastest through space ( a vacuum)

the parts of a magnet where magnetic force (field) is the strongest (north and south)

the number of disturbances of the same type (compressions, crests, troughs, ect..) that pass a point in a second

the part of a sound wave where the molecules are closer together

a unit used to indicate the loudness of a sound

electricity travels through a wire more easily when the wire is __

an electromagnet can be made by wrapping a wire around a(n) __ core

an electron has a __ charge

a device which can be used to decrease voltage and increase current, or to increase voltage and decrease current

the unit used as a measure of the amount of current

a substance which does not permit the passage of electricity

__ electrical charges repel each other

an increase in __ causes an increase in the speed of a sound wave.

a form of energy which can be produced by an electric current moving along a thin filament of wire

when two different objects are rubbed together; __ electricity may result

a transparent device which refracts or bends light rays as they pass through it

the __ coil is the coil of wire in a transformer that electricity from an outside source is flowing through.

light is a type of __ radiation

a __ wire connected to the round post of a plug allows electrical charges to move through a low resistance pathway into the ground (protecting us)

accumulated electrical charges that are at rest (not moving) are __ electricity

traveling faster than the speed of sound

a substance that electricity will flow through is a __

light is bounced back or __ from the surface of mirror

__ electrical charges attract each other

a __ has a silver coated surface so that it reflects (or bounces back) light rays

visible __ occurs at the frequencies which stimulate receptors in our eyes allowing us to see

__s are determined by dividing the voltage by the resistance (ohms)