Question 1
2 out of 2 points
The figure shows a ‘snapshot’ of four different waves in identical ropes
stretched with the same force.
The wave where the speed is greatest is
Selected
Answer:
e.
all of the
above.
Question 2
2 out of 2 points
Two sound waves traveling through the air have different frequencies.
Consequently, they must also have different
Selected
Answer:
c.
wavelengt
hs.
Question 3
2 out of 2 points
The distance between peaks on a wave divided by the time for the wave
to travel this distance is the wave’s
Selected
Answer:
d.
spee
d.
Question 4
0 out of 2 points
The wavelength of the wave shown in this figure is about
Selected
Answer:
b.
not
defined.
Question 5
0 out of 2 points
A source emits sound at a fixed constant frequency f.
If the source moves away from you faster than the speed of sound in air,
the frequency that you hear is
Selected
Answer:
d.
lower
than f.
Question 6
2 out of 2 points
In ultrasound the _____________ of the sound is much greater than in
normal sound.
Selected
Answer:
a.
frequen
cy
Question 7
2 out of 2 points
The number of cycles of a wave passing a point per unit time is the wave’s
Selected
Answer:
a.
frequen
cy.
Question 8
2 out of 2 points
Harmonics
Selected
Answer:
e.
all of the
above
Question 9
0 out of 2 points
A zero decibel sound level
Selected
Answer:
d.
has zero
amplitude.
Question 10
2 out of 2 points
A source emits sound at a fixed constant frequency f.
If you run towards the source, the frequency you hear is
Selected
Answer:
d.
higher
than f.
Question 11
2 out of 2 points
You shout at a cliff, and hear your echo in 2 seconds. If the speed of sound
in the air is 340 m/s, the distance of the cliff from you is
Selected
Answer:
c.
340
m.
Question 12
2 out of 2 points
An echo is a sound wave that has been
Selected
Answer:
a.
reflect
ed.
Question 13
0 out of 2 points
The wavelength of ultrasound at 1 million Hz in air where the speed of
sound is 340 m/s is
Selected
Answer:
d.
0.0000034
m.
Question 14
2 out of 2 points
Ultrasound is used
Selected
Answer:
e.
all of the
above
Question 15
2 out of 2 points
You can hear sound through an open window from sources that are not in
your line of sight because of
Selected
Answer:
b.
diffractio
n.
Question 16
2 out of 2 points
A sound wave in a metal bar is an example of a longitudinal wave.
Selected
Answer:
Tru
e
Question 17
2 out of 2 points
In the troposphere segment of the Earth’s atmosphere, as you increase in altitude the temperature
decreases. This means the speed of sound decreases as you increase in altitude.
Selected
Answer:
Tru
e
Question 18
2 out of 2 points
The maximum displacement of points on a wave from the equilibrium
position is the wave’s wavelength.
Selected
Answer:
Fals
e
Question 19
2 out of 2 points
Two identical sound producers will sound twice as loud as just one.
Selected Fals
Answer: e
Question 20
2 out of 2 points
When a force F stretches a rope of mass per unit length ρ, the velocity of a wave in the rope is
given by
You have two ropes of the same length. The mass of the second rope is
twice the mass of the first rope. The velocity of a wave in the second rope
is times the velocity of a wave in the first rope.
Selected
Answer:
Tru
e
Question 21
2 out of 2 points
A sound level of 80 dB has twenty times the amplitude of a 60 dB sound.
Selected
Answer:
Fals
e
Question 22
2 out of 2 points
If you increase the linear mass density of a rope, the speed of a wave on the rope also increases.
Selected
Answer:
Fals
e
Question 23
2 out of 2 points
When a force F stretches a rope of mass per unit length ρ, the velocity of a wave in the rope is
given by
You have two identical ropes stretched with the same force between two
different sets of posts. The second rope is twice as long as the first rope.
The velocity of a wave in the second rope is half the velocity of a wave in
the first rope.
Selected
Answer:
Fals
e
Question 24
2 out of 2 points
For waves moving through the atmosphere at a constant velocity, higher frequency waves must have
proportionally longer wavelengths.
Selected
Answer:
Fals
e
Question 25
2 out of 2 points
The speed of a wave is the same as the speed of the particles displaced
by the wave.
Selected
Answer:
Fals
e
Question 26
Needs Grading
The speed of a wave is the frequency multiplied by the wavelength. If a 200Hz sound travels through the following materials,
use the given table of speeds of sound to determine the wavelength of sound:
1. Air (20C)
2. Steel
3. Human Tissue
Material Speed (m/s)
Air (20C) 344
Helium 1,006
Water 1,440
Human tissue 1,540
Aluminum 5,100
Granite 4,000
Iron and steel 5,200
Selected
Answer:
IMG-
7555.JPG
Response
Feedback:
[None
Given]
Question 27
15 out of 15 points
Select the closest matching pairs possible. 3 pts for each response.
Question Selected Match
Amplitude D.
Maximum displacement of points on a wave
Frequency A.
The number of cycles of a wave passing a point per unit time
Longitudinal Wave C.
Oscillations are long the direction the wave travels
Wavelength B.
Distance between two like points
on a wave
Transverse Wave E.
Oscillations are perpendicular to the direction the wave travels.
Friday, February 18, 2022 12:18:09 PM EST
