Light, 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
The cells that allow you to see in dim light.
a) rods
b) cones
c) mitochondria
d) electromagnetic
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
According to the law of reflection, the angle of reflection is
a) equal to the angle of incidence
b) dependent on the brightness of the light
c) 90 degrees smaller than the angle of incidence
d) 90 degrees larger than the angle of incidence
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
A mirror that curves inward is a
a) concave mirror
b) convex mirror
c) plane mirror
d) funhouse mirror
All electromagnetic waves ___ in a vacuum.
a) travel at the same speed
b) have the same wavelength
c) have the same frequencies
d) all of the above
A person's perception of intensity
a) brightness
b) amplitude
c) energy
d) laser
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