Physical Science

Chapter 12: Electromagnetic Waves

Electromagnetic Waves

1.
A(n) __________ is a sealed vacuum tube in which beams of electrons are produced.
A)transceiver
B)frequency modulator
C)cathode-ray tube
D)amplitude modulator
2.
In which of the following materials will light travel fastest?
A)air
B)vacuum
C)water
D)glass
3.
Electric current passing through a wire produces __________.
A)geographic poles
B)a compass
C)a magnetic field around the wire
D)a permanent magnet
4.
The specific frequency of the electromagnetic wave that a radio station is assigned is called the __________.
A)amplitude modulation
B)cathode
C)frequency modulation
D)carrier wave
5.
When electrons are shot through two small openings, the result is an interference pattern. This result show that __________.
A)matter can behave like waves
B)attempts to describe nature in terms of waves and particles are futile
C)electrons behave like particles
D)the openings were too small
6.
The energy carried by an electromagnetic wave is called __________ energy.
A)radiant
B)mechanical
C)thermal
D)potential
7.
When light behaves as a particle, it is called a __________.
A)phosphene
B)photon
C)proton
D)phonolite
8.
__________ is a molecule composed of three oxygen atoms.
A)Ozone
B)CFC
C)Nitric oxide
D)An antioxidant
9.
Global Positioning System is a system of satellites, ground monitoring stations and receivers that __________.
A)provide two-way radio service for police cars, fire trucks, and ambulances
B)broadcast television signals
C)provide information about the receiver's exact location at or above Earth's surface
D)provide mobile telephone service
10.
Which of the following electromagnetic waves enables your body to make vitamin D?
A)visible light
B)ultraviolet
C)gamma rays
D)infared waves
11.
Which of the following devices does NOT utilize radio waves?
A)cellular telephone
B)satellite
C)television remote control
D)radar
12.
Which of the following statements about electric charges is true?
A)Air cannot conduct electricity - it is conducted only by solid materials.
B)Opposite electric charges always repel one another.
C)Objects must be touching one another to exert electrical force.
D)Electrical forces act at a distance.
13.
Electric current is created by __________.
A)the movement of neutrons in a wire
B)the movement of electrons in a wire
C)insulators
D)conductors
14.
Whether or not electrons will be ejected from metal when light shines on the metal depends on __________.
A)the frequency of the light
B)the intensity of the light
C)whether there were any electrons in the metal
D)the temperature of the metal
15.
The entire range of electromagnetic wave frequencies is known as __________.
A)ultraviolet radiation
B)visible light
C)the electromagnetic spectrum
D)magnetism
16.
What exerts the force that causes other electric charges to move?
A)an electric field
B)conductors
C)electric poles
D)insulators
17.
Which of the following electromagnetic waves can break molecular bonds?
A)radio waves
B)microwaves
C)infared waves
D)gamma rays
18.
Electromagnetic waves are made by __________.
A)vibrating electric charges
B)vibrating water molecules
C)vibrating air molecules
D)strong compressions
19.
A(n) __________ transmits one radio signal and receives another radio signal from a base unit.
A)carrier wave
B)microwave oven
C)transceiver
D)cathode-ray tube
20.
__________ is the number of vibrations that occur in 1 s.
A)Interference
B)Frequency
C)Amplitude
D)Wavelength