Ch 10, 8th Grade Question Preview (ID: 61121)
Electromagnetic Waves.
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Cell phones transmit and receive signals using
a) microwaves
b) radio waves
c) UV waves
d) gamma rays
Cell phones work only if they are in a ___ system.
a) cellular
b) GPS
c) hub
d) receiver
An electromagnetic wave consists of
a) electric and magnetic fields
b) AM and FM waves
c) electrons and protons
d) particles of a medium
An electromagnetic wave have fields that travel ___ to one another.
a) perpendicular
b) parallel
c) together
d) stacked on top of
Polarized light consists of waves that vibrate
a) in only one direction
b) parallel to each other
c) in all directions
d) none of the above
The only type of electromagnetic wave that you can see is
a) visible light
b) gamma rays
c) radio waves
d) UV rays
AM radio waves can travel farther than FM radio waves because
a) AM waves are reflected by Earth's ionosphere.
b) AM waves produce better sound quality.
c) AM waves are faster than FM waves.
d) AM waves have constant amplitude.
Which of the following is listed in order of increasing energy?
a) radio waves, visible light, x rays
b) x rays, visible light, radio waves
c) infrared rays, visible light, radio waves
d) visible light, gamma rays, x rays
The energy that electromagnetic waves transfer through matter or space is called
a) electromagnetic radiation
b) thermal radiation
c) perpendicular radiation
d) x rays
A packet of light energy is called a
a) photon
b) neuron
c) interneuron
d) photoelectric effect
Which is NOT an electromagnetic wave?
a) sound
b) x ray
c) gamma ray
d) visible light
Radar is used to
a) detect objects and measure their distance and speed
b) call people
c) pick up sound waves
d) see inside the body
An infrared camera takes pictures called
a) thermograms
b) thermographs
c) thermometers
d) thermopics
Visible light that appears ___ is actually a mixture of many colors
a) white
b) black
c) pink
d) purple
What kind of vitamin does UV rays cause cells to make?
a) D
b) K
c) A
d) C
Why does a dentist cover you with a lead apron to take Xrays of your teeth?
a) to protect you from xrays
b) to get a better shot of the teeth
c) to black out everything else except the teeth
d) becuae they love to get the lead out
The electromagnetic spectrum includes the complete range of electromagnetic waves placed in order of
a) increasing frequency
b) increasing amplitude
c) increasing wavelength
d) decreasing frequency
AM signals travel as
a) changes, or modulations, in the amplitude of the wave
b) by changing the frequency of the wave
c) changing the wavelength of the wave
d) changing all of the above
FM waves meet the ionosphere. What do they do?
a) they pass through the ionosphere
b) they don't pass through the ionosphere
c)
d)
Which is more expensive to operate?
a) a satellite phone
b) a landline
c) a cell phone
d) walkie talkies
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