The Electromagnetic Spectrum
What is a system that uses reflected radio waves to detect objects and to measure their distance and speed?
Radar
Which type of electromagnetic waves carry television signals?
Radio waves
How does an electromagnetic wave occur?
When electric and magnetic fields vibrate at right angles to each other
What is the movement of electrons in a substance when light is shined on it called?
the photoelectric effect
What is a picture produced by an infrared camera?
thermogram
True or False? Electromagnetic waves can only transfer energy through a medium?
False
True or false? If two polarizing filters are placed so that one is rotated 90 degrees from the other, all light can come through?
False
Why are gamma rays the most penetrating of all electromagnetic rays?
Because they have the greatest amount of energy.
How can the photoelectric effect be explained?
By thinking of light as a stream of tiny packets of energy
What is every charged particle surrounded by?
A magnetic field
Magnetic Field
A region in which magnetic forces are exerted
What kind of stream can light act like?
A stream of particles of energy
What are electromagnetic waves?
A transverse wave that transfers electrical and magnetic energy
When light passes through a polarizing filter, what properties does it have? Those of a wave or a particle?
A wave
What is the energy that is transferred by electromagnetic waves called?
Electromagnetic radiation
What do radio stations transform sound into?
Electronic signals
What happens when light passes through a polarizing filter?
Only the waves vibrating in one direction pass through. The light that passes through is polarized light.
Why do bones show up lighter on photographic plates in an x-ray machine?
bones absorb x-rays and don't allow them to pass through
What are all of the colors of visible light from longest wavelength to shortest?
red orange yellow green blue violet
What instrument is used to view different colors of light produced by a light bulb?
spectroscope
Electric Field
A region in which particles are surrounded
True or False? All electromagnetic waves travel at the same speed in a vacuum?
True
True or false? Microwaves are used for cellular phone communication?
True
True or false? White light is made up of a mixture of many colors of light?
True
True or false? Microwaves are the radio waves with the shortest wavelengths and highest frequencies?
True
What is the visible part of the electromagnetic spectrum?
visible light
What are particles of light energy called?
Photon
What happens to the magnetic field when an electric field vibrates?
The magnetic field vibrates too
What do electromagnetic waves consist of?
Vibrating electrical and magnetic fields that move through space at the speed of light
What does a radio transform waves into?
electrical signal
What is the name for the range of electromagnetic waves when they are placed in order of increasing frequency?
electromagnetic spectrum
What are the electromagnetic waves with the shortest wavelengths and highest frequencies?
gamma rays
What is the energy you feel as heat from an electric burner is carried by electromagnetic waves?
infrared rays
What are electromagnetic waves with wavelengths shorter than those of visible light?
ultraviolet rays
What are electromagnetic waves with frequencies higher than ultraviolet rays but lower than gamma rays?
x-rays
