Question 13.5 pts
The transverse wave move in a direction ______.
Group of answer choices
that changes with speed
along the direction of wave travel
that is at right angle to the direction of wave travel
Question 23.5 pts
If a singer is able to shatter a crystal chandelier with her voice, this illustrates an example of ______.
Group of answer choices
an echo
interference
resonance
sound refraction
beats
Question 33.5 pts
If a child swinging to and fro on a swing stands up, her time for a to-and-fro swing is _______.
Group of answer choices
longer
unchanged
shorter
Question 43.5 pts
A water wave passes by a floating wine cork that oscillates up and down two cycles each second. The wave frequency is ______.
Group of answer choices
6 Hz
0.5 Hz
2 Hz
3 Hz
1 Hz
Question 53.5 pts
A wave makes 90 vibrations per second. It travels a distance of 40 meters in one second. Its frequency is then _______.
Group of answer choices
5400 hertz and it travels at 2 m/s
90 hertz and it travels at 40 m/s
40 hertz and it travels at 90 m/s
none of the above
Question 63.5 pts
An object that completes 30 vibrations in 5 seconds has a frequency of ______.
Group of answer choices
150 hertz
1 hertz
0.17 hertz
6 hertz
Question 73.5 pts
Sound waves in air travel at higher speeds if the temperature of the air is _______.
Group of answer choices
cold
warm
average
any of the above
Question 83.5 pts
At high amplitudes, the pendulum clock runs _______.
Group of answer choices
slow
normally as it does at sea level
fast
Question 93.5 pts
When designing a music hall, the engineer is concerned with ______.
Group of answer choices
reverberations
echoes
reflection
all of the above
none of the above
Question 103.5 pts
The human hearing range is about _______.
Group of answer choices
40 hertz to 40,000 hertz
10 hertz to 10,000 hertz
20 hertz to 20,000 hertz
none of the above
Question 113.5 pts
Forced vibration can produce resonance that requires the ________.
Group of answer choices
matching of constructive and destructive interference
matching of wave amplitudes
maximum amount of energy input
minimum beat frequency
least amount of energy input
Question 123.5 pts
A less intense sonic boom at ground level can occur if the aircraft ________.
Group of answer choices
is smaller
is more streamlined
flies higher
all of the above
none of the above
Question 133.5 pts
One of the reasons for the higher pitch of your voice after you've inhaled some helium is that sound travels ______.
Group of answer choices
the same speed in helium but with a longer wavelength
faster in helium than in air
slower in helium than in air
Question 143.5 pts
A sound wave with a speed of 340 m/s and frequency of 340 Hz. The wavelength is ______.
Group of answer choices
100 m
1000 m
1 m
10 m
none of the above
Question 153.5 pts
Human hearing is most efficient in hearing _______.
Group of answer choices
infrasonic sound
ultrasonic sound
both of these
neither of these
Question 163.5 pts
In standing waves, a node is a position of _______.
Group of answer choices
maximum amplitude
half amplitude
minimum amplitude
Question 173.5 pts
A 1050-hertz tuning fork is sounded at the same time a piano note is struck. You hear three beats per second. What is the frequency of the piano string?
Group of answer choices
1047 hertz
3168 hertz
1046 hertz
1053 hertz
need more information
Question 183.5 pts
If the amplitude of a wave is 1 meter, then the crest-to-trough distance of the wave must be ______.
Group of answer choices
1 m
0.5 m
2 m
none of the above
Question 193.5 pts
The origin of a sonic boom ________.
Group of answer choices
must be a sound emitter
is not a sound emitter
may or may not be a sound emitter
none of the above
Question 203.5 pts
When the energy of a wave dissipates into heat, this reduces the wave's _______.
Group of answer choices
wavelength
period
frequency
speed
amplitude
Please show your full solution steps. First state what is given, then start with the symbolic equation, then show data entered into the equation, and then the final answer with proper units. Please write your steps vertically. You will not gain credit for showing only the answer.
Question 2110 pts
A piano string vibrates at an unknown frequency. In order to determine the frequency, a tuning fork of frequency of 440 Hz is sounded at the same time the piano key is struck. A beat frequency of 4 beats per second is heard. What are the possible frequencies at which the string could be vibrating?
Question 2210 pts
A bat flying toward a wall emits a sound. It receives its echo 0.2 sec later. How far is the wall from the bat?
the bat.
Question 2310 pts
On a piano, you strike a key whose frequency is 256 Hz.
a) What is the period of this tone?
b) If the speed of the tone in air is 340 m/s, what is its wavelength?
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