Light Energy: Question Preview (ID: 27681)

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Why do radiologists use X-rays instead of visible light to see inside our bodies?
a) X-rays have more energy than visible light. b) X-rays are not as colorful as visible light. c) Nothing is known to travel faster than X-rays. d) X-rays travel in a straight line.
Which of the following is true?
a) Long wavelength = high-frequency and low energy b) long wavelength = low frequency and low energy c) long wavelength = low frequency and high energy d) long wavelength = high frequency and high energy
Which is true about the human eye?
a) A) The lens and retina help focus light. b) B) The lens and pupil send images to the brain. c) C) The pupil and iris control how much light enters the eye. d) Both a and c
We see color because _________.
a) objects reflect the colors we see b) objects absorb the colors we don’t see c) objects with color have pigments d) all of the above
What affects the shadow an object will make?
a) the angle of the light source b) how near or far the light source is c) whether the object is opaque, translucent, or transparent d) all of the above
How does light behave when it hits an opaque surface?
a) It is absorbed or reflected. b) Some light passes through. c) It refracts or bends. d) It passes through in a straight line.
Light rays refract in a glass of water because__________.
a) light moves at different speeds through different materials b) light bounces off a smooth surface at the same angle at which it strikes it c) light moves in a curved path d) the light moves the water from side to side
Light is __________.
a) moving matter b) reflected radiation c) radiant energy d) invisible colors
Which of these is a natural light source?
a) incandescent lightbulbs b) stars in the night sky c) both d) neither
Which is NOT true about how light moves?
a) It moves in waves. b) It moves at the same speed as sound. c) It can move through the nothingness of space. d) It moves as packets of energy called photons.
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