Review For Unit 10 Test
Waves
1. The pitch of a sound wave is determined by the _Frequency_ of
the sound wave.
2. The loudness of a sound made by plucking a guitar string is
determined by the _Amplitude_ of the sound wave.
3. A bat emits a series of short, high-pitched sounds that bounce
off an object to give the bat a sense of what is in its path. This
is an example of which wave behavior? __Reflection_____
4. A female American Idol contestant sings at a frequency of
2,100 Hz and a dog growls at a frequency of 85 HZ. Which one
produces the shortest wavelength? The Female American Idol
contestant produces a higher frequency so the wavelength
would decrease or be the shortest.
X- Ray
Radio Waves
5. Students used rope to model radio waves and x-rays.
Compared to the model of radio waves, the model of the xrays has greater __Frequency__.
6. If you increase the frequency of a wave the _Wavelength__
decreases.
7. What type of wave is illustrated below? _Compressional_
8. Another name for a compression wave is a _longitudinal_
wave.
9. The Doppler Effect is an apparent change in the
wavelength, but the wave emitted by the source is actually
constant. As a motorcycle approaches and blows its horn,
the apparent decrease in the wavelength will make the
sound __higher___ in pitch.
10. Submarines use a sonar transmitter which emits a burst of
waves while submerged. The waves reflect off objects in the
distance and return to the submarine. The time that it takes
for the waves to travel to the object and return to the
submarine tells the sonar operator _how close the objects are.
11. Which type of wave interaction happens inside a material
rather than at the surface of the material? __absorption___
12. What wave process explains what happens when a wave
crosses from one medium to another, such as when it moves
from glass to water? _refraction__
13. “Night Vision” goggles can be used to see people and
animals at night and in dark places. What kind of wave is
likely detected by these devices? __infrared rays__
14. What is the period of a wave traveling at 6 m/s with a
wavelength of 3.3 m? Period = velocity / wavekength
6m/s / 3.3 m = 1.81 sec
14. Veterinarians often install a programmable microchip
under the skin of a new pet that, when scanned, gives off
a signal that indicates the name of the owner and the
vaccinations the pet has been given. What type of wave
would be the safest and most effective for this microchip
to use? __radio waves____
16. Label the waves as transverse or compression
17. Label the following parts of a wave on each of the waves: ( wavelength,
amplitude, crest or compression, trough or rarefaction )
wavelength
amplitude
compression
rarefaction
Calculate the velocity, frequency or
wavelength of each wave.
18. What is the frequency of a wave that has a
wavelength of 1.5 m and a wave speed of 3.2 m/s?
f = v/wavelength f = 3.2m/s / 1.5 m = 2.13 Hz
19. What is the velocity of a wave with a wavelength
of 2.2 m and a frequency of 4.1 Hz?
v = f x wavelength 4.1 Hz x 2.2 m = 9.02 m/s
20. If a wave has a speed of 4.4 m/s and a frequency
of 2.2 Hz what will its wavelength be?
wavelength = v / f 4.4 m/s / 2.2 Hz = 2 m