Final Review
Concepts of Physics
Part III – Chapters 25-30 (Waves, Sound, & Light)
1) Compared to the speed of light, Sound travels
A) faster.
B) slower.
C) at the same speed.
2) Sound waves are produced by
A) radio stations.
B) vibrating objects.
C) objects under pressure.
Vsound = 331 + (.6 x °C)
 in air
v=λf
D) soft objects.
E) None of the above
3) Sound waves in air are a series of
A) high- and low-pressure regions. D) periodic condensations and rarefaction
B) high- and low-frequency pulses E) All of the above
C) periodic disturbances.
4) The speed of sound in dry air at 20 degrees Celsius at 340 m/s. How far away is a jet plane when you
notice a 2 second delay between seeing the plane and hearing it?
A) 68OO m.
D) 40 m.
B) 680 m.
E) 20 m.
C) 340 m.
5) Suppose a bug is jiggling up and down and swimming towards you at the same time. Compared to the
frequency at which the bug is emitting waves, the frequency of the waves reaching at you is
A) higher.
B) lower.
C) just the same.
6) The Doppler effect is the change in observer frequency due to
A) the type of medium the wave is in.
B) the original frequency of the source.
C) the type of wave.
D) the motion of the source or observer
E) All of the above
7) When a sound source moves towards you. What happens to the wave speed?
A) It increases. B) It decreases. C) It stays the same.
8) What happens when an airplane is flying faster than the speed of sound?
A) A shock wave is producedB) There is no sonic boom.
C) It becomes very quiet inside the plane.
D) Nobody can hear the plane fly overhead.
E) None of the above
9) A wave with a frequency of .05 Hz has a wavelength of 10m, what is the wave’s speed?
A) 200 m/s.
B) 10 m/s.
C) 0.5 m/s.
D) 0.05 m/s.
E) 0.005 m/s.
10) A wave created by shaking a rope up and down is called a
A) longitudinal wave.
B) transverse wave.
C) standing wave.
D) constructive wave.
E) Doppler wave.
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Final Review
Concepts of Physics
11) Sound is an example of a
A) longitudinal wave.
B) transverse wave.
C) standing wave.
D) constructive wave.
E) Doppler wave.
12) A wave
A) carries energy from one place to another.
B) has a period.
C) has a wavelength.
D) has a velocity.
E) All of the above
13) The time needed for a wave to make one complete cycle is Called its
A) frequency.
B) period.
C) wavelength.
D) velocity.
E) amplitude.
14) The distance between successive identical parts of a wave is called its
A) frequency.
B) period.
C) wavelength.
D) velocity.
E) amplitude.
15) Which of the following is NOT an electromagnetic wave?
A) Sound
B) Radio
C) lnfrared
D) Light
E) X-ray
16) Compared to air, the speed of light in water is
A) slower.
B) faster.
C) the same.
17) The image your eye receives on its retina is
A) right-side up.
B) up-side down
18) On a bright day, the iris of the eye changes so the pupil
A) becomes larger.
B) becomes smaller.
C) stays the same as always.
19) If a persons eyes cannot form sharp images at any distance, the person
A) is nearsighted.
B) is farsighted.
C) has astigmatism.
20) A magnifying glass is usually a
A) diverging lens.
B) converging lens.
C) combination of diverging and converging lenses.
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Final Review
Concepts of Physics
21) The human eye
A) contains a lens that focuses light rays.
B) contains a layer of tissue that is sensitive to light.
C) regulates the amount of light entering it.
D) transmits signals to the brain via nerves.
E) All of the above
22) The eyes of nearsighted people focus light
A) in front of the retina.
B) behind the retina.
C) at the retina.
23) Farsighted people need to wear glasses that contain
A) converging lenses.
C) neither converging nor diverging lenses.
B) diverging lenses.
24) A converging lens
A) will bend parallel rays of light they cross at a single point.
B) is thicker in the center than at the edges.
C) will converge parallel rays of light
D) refracts parallel rays of light
E) All of the above
25) An image of a distant object formed by a single converging lens
A) is real.
B) is upside down
C) can be projected on a wall
D) can be focused on a screen.
E) All of the above
26) The law of reflection says that
A) all waves incident on a mirror are reflected.
B) waves incident on a mirror are partially reflected.
C) the angle a ray is reflected from a mirror is random.
D) the angle of reflection from a mirror equals the angle of incidence.
27) Drawing ray diagrams allows you to
A) identify the type of image
B) figure out where an image will be located.
C) locate a convergent point
D) figure out if the image is inverted
E) All of the above
28) In drawing a ray diagram, one of the rays can be drawn
A) parallel to the axis.
B) through the center of the lens.
C) through the focal point in front of the lens.
D) from the tip of the object arrow.
E) All of the above
29) A rainbow occurs because
A) sunlight is refracted by water in the raindrops.
B) sunlight is selectively absorbed by water in the raindrops.
C) sunlight falls on different size raindrops.
D) different color raindrops arrange themselves in bands of color.
E) None of the above
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Final Review
Concepts of Physics
30) The critical angle for a light from the bottom of a swimming pool shining
upward toward the pool’s surface is the angle
A) at which some light is reflected from the surface.
B) at which all light is refracted out of the lake
C) where light is refracted so it just skims the lake surface.
D) 42 degrees.
E) 43degrees.
31) The reason we can read print from any direction is that
A) letters emit black light in all directions.
B) letters absorb black light from all directions.
C) the white part of the page reflects light in all directions.
D) All of the above
E) None of the above
32) When refraction occurs, part of a wave
A) is bent more than another part.
B) slows down before another part.
C) is pushed to one side.
D) All of the above
E) None of the above.
33) Refraction occurs
A) only with light waves.
B) at any, unpredictable time.
C) when a wave changes speed.
D) only at a wave front.
E) All of the above
34) When blue and yellow paints are mixed together, the result is green. The reason for this is that
A) blue and yellow are complementary colors.
B) blue reflects only blue light, and yellow reflects almost all colors of light.
C) blue absorbs yellow light and yellow absorbs blue light.
D) between blue and yellow pigments, all colors are absorbed except green
E) yellow pigments absorb green light and reflect all the others.
35) The reason the sky is blue is that air molecules
A) absorb then reemit blue light, scattering it in all directions.
B) reflect blue light.
E) are blue.
C) absorb yellow light.
D) absorb green light.
36) The earth receives a lot of ultra violet radiation from the sun. Luckily most
of it doesn’t reach the ground, because it is
A) scattered by the upper atmosphere.
B) absorbed by a protective Layer of ozone gas in the upper atmosphere.
C) absorbed by the large amount of air in the atmosphere.
D) Actually there isn’t enough UV radiation coming from the sun to harm us.
37) On the moon, the daytime sky looks
A) blue.
D) red
B) yellow.
E) black
C) white.
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Final Review
Concepts of Physics
38) The colors of an object we see around us is determined by the
A) frequencies of light absorbed by the object
B) frequencies of light reflected by the object.
C) colors of light shining on the object.
D) colors of light reflected by the object
E) All of the above
39) The three primary colors of light addition are
A) red, yellow, and green.
B) red, yellow, and blue.
C) red, green, and blue.
D) yellow, green, and blue.
E) yellow, cyan, and red.
40) When red and green light shine on a white sheet, the resulting color is
A) blue.
B) cyan.
C) green.
D) yellow.
E) magenta.
41) When light is reflected from a surface, it is
A) polarized parallel to the surface.
B) polarized perpendicular to the surface.
C) randomly polarized.
42) What is the ultimate source of electromagnetic waves?
A) T.V. antennas
E) Radio sets
B) Vibrating atoms
C) Vibrating charged particles
D) Vibrating molecules
43) Sound can travel through solids, liquids, gasses and even a vacuum. (T or F)
44) Viewing light through “3D” glasses causes the light to be
A) randomly polarize
B) polarized
C) totally blocked.
45) Light reflected from a lake surface is polarized
A) vertically.
B) horizontally.
C) randomly.
46) Light waves are
A) transverse waves.
B) longitudinal waves.
47) If two Polaroid sunglasses are held at right angles to each other, the amount
of light transmitted is
A) twice as much as usual
B) the same as usual.
C) half as much as usual.
D) totally blocked.
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Final Review
Concepts of Physics
48) How far is light-second?
A) 95,000,000,000 km
B) 18.000,000 km
C) 9.000,000 km
D) 300,000 km
E) 5,000 km
49) Electromagnetic waves are
A) transverse waves.
B) longitudinal waves.
50) The speed of a sound wave depends on
A) its frequency.
B) its wavelength.
C) the air temperature
D) All of the above
E) None of the above
51) Sound travels faster in air if the air is
A) warm.
B) cold.
C) Neither warm nor cold.
52) A pulse of compressed air that is part of a sound wave is called a rarefaction (T or F)
53) When an object is forced to vibrate at its natural frequency, resonance occurs (T or F)
54) Resonance occurs when you
A) push on an object
B) hit an object with a hammer.
C) vibrate and object
D) vibrate at its natural frequency.
E) All of the above
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