Practice Test

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Practice Test: Waves
Name: _________________________________
Questions 1 - 5 refer to the diagram below.
1.
Is this a longitudinal or transverse wave? __________________________
2.
Use a ruler to measure the amplitude of the wave: _____________________
3.
Use a ruler to measure the wavelength of the wave: ___________________
4.
If the wave shown above traveled at 238 cm/sec, what is the frequency? _______________
5.
Draw a wave that has the same amplitude and half the wavelength.
6.
A 5 meter long sound wave traveling through steel has a frequency of 1026 Hz. What is the speed
of sound in steel?
7.
Lasers and rogue waves are examples of _____________________ interference.
8.
Resonance occurs when energy is added to an object in time with its ________________________
9.
Resonance causes the _________________________ of vibration to increase dramatically.
Questions 10 – 12 refer to the diagram below
10.
Are these waves in phase or out of phase with each other? ________________________________
11.
Would these waves produce constructive or destructive interference? _______________________
12.
Draw the resultant wave.
Questions 13 – 14 refer to the standing wave in the diagram above
13.
Put the letter A at each antinode, and the letter N at each node.
14.
Which harmonic is shown?
15.
Changing the frequency affects the _________________ of a sound wave and the
________________ of a light wave
16.
Changing the amplitude affects the _________________ of a sound wave and the
________________ of a light wave
17.
The loudness of sound is measured in units called ______________________
18.
Are sound waves transverse or longitudinal waves? _____________________________-
19.
What happens to the frequency of the sound made by a car as it moves toward you?
What name is given to this phenomenon?
20.
How can we tell if a star or galaxy is moving away from us?
Questions 21 – 22 refer to the diagram above which shows the sound waves produced by airplane “A”
21.
Is airplane “A” moving to the left or the right? _______________
22.
Is airplane “A” moving faster than or slower than the speed of sound? ___________________
23.
Light can be thought of as mass-less particles called _________________
24
What wavelength of electromagnetic radiation is just longer those which we can see?
25.
What are the three primary colors of light?
26.
Why are there only three primary colors?
27.
A banana looks yellow in white light because it absorbs ______________________________
A rose looks magenta in white light because it absorbs ___________________________________
What color would the magenta rose look in blue light? _________________________________
28.
What color would the magenta rose look in yellow light? ________________________________
What color would the magenta rose look in green light? ________________________________
What is the law of reflection?
Questions 29 – 30 refer to the diagram above.
29.
Draw the normal lines and the reflected rays for the mirrors shown above
30.
Which of the mirrors shown above could be used to magnify an image? __________________
31.
Complete the diagrams above showing the path of the refracted rays
32.
Complete the ray diagram for each lens shown above. Assume that light travels slower inside the
lenses.
33.
Look at the ray diagram above. Put an “F” at the focus, a “U” where the image formed by the lens
is upside down, and an “R” where the image is right side up and magnified.
34.
If light travels at 1.79  108 m/s through Substance X, what is its index of refraction? __________
35.
Cubic Zirconium has an index of refraction of 2.20, how fast does light travel through Cubic
Zirconium? _______________
Find the value of the unknown variable in each of the diagrams below
36.
37.
= 25o
=48o
n = 2.18
n = ________
n = 1.22
n = 1.95
 = _______
=32o
38.
Describe two experiments that could be performed to show that light is a wave.
39.
What made the Tacoma Narrows bridge collapse?
40.
In what ways are sound and light alike? In what ways are they different?
1) transverse
2) 2.0 cm
3) 7.5 cm
4)  32 Hz
5) (there should be 4 crests and 4 troughs)
6) 5130 m/s
7) constructive
8) natural frequency
9) amplitude
10) in phase
11) constructive
12)
13)
14) 3rd
15) pitch, color
16) loudness, brightness
17) decibels
18) longitudinal
19) increases, Doppler effect
20) light waves will be shifted toward the red end of the spectrum due to Doppler shift
21) left
22) faster
23) photons
24) infrared
25) red, green, blue
26) we have three types of color-sensitive nerves in our retinas
27) blue, green, blue, red, black
28) angle of incidence = angle of reflection
29)
30) A
31)
32)
33)
34) 1.68
35) 1.36  108 m/s
36) 49o
37) 1.39
38) polarization, refraction, Doppler shift, constructive/destructive interference
39) wind moved the bridge deck up and down in time with its natural frequency, causing resonance
40) same: both are waves, have amplitude and frequency, show Doppler shifts and interference
Different: sound needs a substance to travel through, light doesn’t Sound is a longitudinal wave, light
is a transverse wave. Light can be polarized, sound can not
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