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Ch 4 Physics
Electromagnetic Energy
Question Answer
What are the electromagnetic properties? frequency, wavelength, velocity, amplitude
What formulas are used to describe how electromagnetic energy behaves? wave equation, inverse square law
A field or state of energy found all around us. Also found in x-rays, radiowaves, microwaves, and visible light is called: electromagnetic energy
An uninterrupted (continuous) ordered sequence of energy that exist over a wide range. continuum
The smallest quantity of any type of electro-magnetic energy. photon
The photon, a small bundle of energy that travels through space at the speed of light, is also referred to as a: quantum
Velocity, or speed of light, is equal to what? 186,000 miles per second
What is the SI unit for velocity (speed of light)? 3 x 10^8 m/s
Do photons have mass? no
Do photons have electrical and magnetic fields? yes
A variation in the movement of photons in electrical and magnetic fields. sinewave
The gravitational field that governs the interaction of electrostatic charges is the: electric field
The gravitational field that governs the interaction of magnetic poles is the: magnetic field
Oscillation of electricity in both directions within a conductor. alternating current
Flow of electricity in one direction within a conductor. direct current
One-half the range from crest to valley over which the sine wave varies refers to the: amplitude
The number of wavelengths that pass a point of observation per second; rate of rise and fall. frequency
What is the measurement of frequency? hertz (Hz)
The distance form one crest to another, from one valley to another, or from any point on the sine wave to the next corresponding point. wavelength
The three wave parameters needed to describe electromagnetic energy are: velocity, frequency, wavelength