Physical Science Chapter 11
The specific frequency of the electromagnetic wave that a radio station is assigned is called the ________.
carrier wave
As the frequency of an electromagnetic wave increases, the wavelength _______.
decreases
An electric signal that has only two possible values (ON and OFF) is a __________.
digital signal
Television stations broadcast which type of signal?
digital signal
What type of waves do not require matter to carry energy?
electromagnetic
The modification of a radio wave to carry information does NOT alter the _______ of the wave.
frequency
________ is the number of vibrations that occur in 1 s
frequency
Which of the following electromagnetic waves can destroy cancer cells?
gamma rays
Which of the following electromagnetic waves can travel through matter and cause damage to cells?
gamma rays
What type of electromagnetic wave transmits thermal energy from a fireplace?
infrared waves
Which electromagnetic waves are most similar in length to microwaves?
infrared waves
Which type of electromagnetic wave can be used to determine how energy-efficient a house is?
infrared waves
When electrons are shot through two small openings, the result is an interference pattern. This shows that ________.
matter can behave like waves
Electromagnetic waves with wavelengths between about 1 cm and 20 cm are called ________.
microwaves
Communications satellites use microwaves instead of radio waves because _______.
microwaves travel more easily through the atmosphere than radio waves
_______ is a molecule composed of three oxygen atoms.
ozone
________ are small, portable radio receivers used by restaurants to alert customers that their tables are ready.
pagers
A(n) __________ is an electromagnetic wave that behaves like a particle.
photon
The Global Positioning System is a system of satellites, ground monitoring stations and receivers that _________.
provide information about the receiver's exact location at or above Earth's surface
The energy carried by an electromagnetic wave is called _______ energy.
radiant
Radar uses ________ to track airplanes and ships.
radio waves
Which of the following devices uses infrared waves?
television remote control
The entire range of the electromagnetic wave frequencies is known as _______.
the electromagnetic spectrum
Whether or not electrons will be ejected from metal when light shines on the metal depends on ________.
the frequency of the light
How is interference avoided between the signals that come to your cordless phone transceiver and those that it sends?
the signals have different frequencies
A(n) _________ transmits a radio signal at one frequency and receives radio signals at a different frequency.
transceiver
Sunscreen is designed to protect your skin from exposure to too much ___________.
ultraviolet radiation
Which of the following electromagnetic waves enables your body to make vitamin D?
ultraviolet waves
In which of the following materials will light travel the fastest?
vacuum
Which of the following produces electromagnetic waves?
vibrating charged particles
Electromagnetic waves are made by _________.
vibrating electric charges
Electromagnetic waves that can be detected by the human eye are called _________.
visible light
