Sound Question Bank |
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\[1\star\]
How does the speed of sound in air change with temperature?
Increases with decreasing temperature - C
Increases with increasing temperature - A
Not affected by temperature - D
Decreases with increasing temperature - B
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Choose the correct answer
\[2\star\]
Radio waves, microwave waves, and X-ray waves - where is the speed of sound greater?
In liquid medium - C
In vacuum - A
In solid medium - D
In gaseous medium - B
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\[3\star\]
Which of the following properties determines the pitch of a sound (sound tone)?
Intensity - C
Amplitude - A
Phase - D
Frequency - B
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\[4\star\]
What determines the intensity of sound?
Wavelength - C
Wave frequency - A
Wave amplitude - D
Wave speed - B
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\[5\star\]
What is the Doppler effect?
Reflection of sound waves - C
from solid barriers
Interference of two sound - A
waves with the same frequency
Change in observed frequency due to - D
relative motion between source and observer
Change in sound speed with change in medium - B
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\[6\star\]
What is the basic condition for forming standing waves in an air column?
Tube length must be proportional to half - C
wavelength or its multiples
Tube length must equal the sound wavelength - A
Sound frequency must equal the - D
tube's resonant frequency
Sound speed in air must be constant - B
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\[7\star\]
In a tube open at both ends, how many nodes form at the fundamental frequency?
\[3\;\;\;\;\;\;-C\]
\[1\;\;\;\;\;\;-A\]
\[4\;\;\;\;\;\;-D\]
\[2\;\;\;\;\;\;-B\]
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\[8\star\]
What is the fundamental frequency of a tube closed at one end with length 1 meter if the speed of sound is
\[v=340\;m/s\]
\[f=255\;\;HZ\;\;\;\;\;\;-C\]
\[f=170\;\;HZ\;\;\;\;\;\;-A\]
\[f=340\;\;HZ\;\;\;\;\;\;-D\]
\[f=85\;\;HZ\;\;\;\;\;\;-B\]
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\[9\star\]
If the length of a tube open at both ends is 0.5 meters, what is the wavelength of the fundamental frequency?
If the speed of sound is \[v=340\;m/s\]
\[λ=1.5\;\;m\;\;\;\;\;\;-C\]
\[λ=0.5\;\;m\;\;\;\;\;\;-A\]
\[λ=2\;\;m\;\;\;\;\;\;-D\]
\[λ=1\;\;m\;\;\;\;\;\;-B\]
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\[10\star\]
At the beginning of a symphony, the sound intensity level was
\[10 \;\;dB\] and rose to
\[70 \;\;dB\]
The pressure level increased by
6 times - C
1000 times - A
100000 times - D
60 times - B
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\[11\star\]
An ambulance emits a sound with frequency
\[250 \;HZ\] while moving at speed
\[40\;m/s\] in still air where the speed of sound is
\[344\;m/s\]. What frequencies are observed by a person inside a car moving behind the ambulance in the same direction at speed
\[20\;m/s\]
\[f_d=250\;\; HZ\;\;\;\;\;\;-C\]
\[f_d=211\;\; HZ\;\;\;\;\;\;-A\]
\[f_d=237\;\; HZ\;\;\;\;\;\;-D\]
\[f_d=200\;\; HZ\;\;\;\;\;\;-B\]
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\[12\star\]
An ambulance emits sound at a certain frequency, and there is a red car, a black car, and a man standing by the road
with the speed and direction of each car shown in the figure
Arrange the pitch from highest to lowest heard by each of
the ambulance driver, the red car driver, the black car driver, and the man
\[ fD>fC>fB>fA\;\;\;\;\;\;-C\]
\[fA>fC>fA>fB \;\;\;\;\;\;-A\]
\[fC>fA>fB>fD\;\;\;\;\;\;-D\]
\[ fC>fD>fA>fB\;\;\;\;\;\;-B\]
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\[13\star \star\]
A tube closed at one end produced a fundamental frequency of standing wave resonance
\[f_1=200\;HZ\]. Which of the following frequencies cannot be a standing wave resonance for this tube?
\[f=1400\;\; HZ\;\;\;\;\;\;-C\]
\[f=200\;\; HZ\;\;\;\;\;\;-A\]
\[f=600\;\; HZ\;\;\;\;\;\;-D\]
\[f=400\;\; HZ\;\;\;\;\;\;-B\]
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\[14\star\]
A tube closed at one end and containing air, when excited, produces a fundamental tone with frequency
\[f_0=210\;HZ\]. If the same tube is open at both ends and contains air
then the fundamental frequency that can be excited is (in Hz)
\[f_1=420\;\; HZ\;\;\;\;\;\;-C\]
\[f_1=105\;\; HZ\;\;\;\;\;\;-A\]
\[f_1=630\;\; HZ\;\;\;\;\;\;-D\]
\[f_1=210\;\; HZ\;\;\;\;\;\;-B\]
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\[15\star\star\]
A tube closed at one end was placed in front of a tuning fork and standing waves were obtained
The air inside the tube was heated and at a certain temperature another standing wave was obtained
By studying the wave properties, one of the following answers is correct
Speed decreases – Frequency constant - C
- Wavelength increases
Speed decreases – Frequency increases - A
- Wavelength decreases
Speed increases – Frequency decreases - D
- Wavelength decreases
Speed increases – Frequency constant - B
- Wavelength increases
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Solve the following problems
1
A tube open at both ends with length
\[0.6 \;\; m\] had a tuning fork placed in front of it and a standing wave formed
containing three nodes and four antinodes. If the speed of sound in air is
\[v=340\; m/s\]
Calculate the wavelength of the standing wave
\[.........................................\;\;\;\;\;\;....................................\]
\[........................................\;\;\;\;\;\;....................................\]
Calculate the frequency of the standing wave
\[.........................................\;\;\;\;\;\;....................................\]
\[........................................\;\;\;\;\;\;....................................\]
Calculate the fundamental frequency
\[.........................................\;\;\;\;\;\;....................................\]
\[........................................\;\;\;\;\;\;....................................\]
Click here to show solution
2
A tube closed at one end with length
\[0.5 \;\; m\] had a tuning fork placed in front of it and a standing wave formed
containing four nodes and three antinodes. If the speed of sound in air is
\[v=340\; m/s\]
Calculate the wavelength of the standing wave
\[.........................................\;\;\;\;\;\;....................................\]
\[........................................\;\;\;\;\;\;....................................\]
Calculate the frequency of the standing wave
\[.........................................\;\;\;\;\;\;....................................\]
\[........................................\;\;\;\;\;\;....................................\]
Calculate the fundamental frequency
\[.........................................\;\;\;\;\;\;....................................\]
\[........................................\;\;\;\;\;\;....................................\]
Click here to show solution
How does the speed of sound in air change with temperature?
Increases with decreasing temperature - C |
Increases with increasing temperature - A |
Not affected by temperature - D |
Decreases with increasing temperature - B |
Click here to show solution
Choose the correct answer
Radio waves, microwave waves, and X-ray waves - where is the speed of sound greater?
In liquid medium - C |
In vacuum - A |
In solid medium - D |
In gaseous medium - B |
Click here to show solution
Choose the correct answer
Which of the following properties determines the pitch of a sound (sound tone)?
Intensity - C |
Amplitude - A |
Phase - D |
Frequency - B |
Click here to show solution Choose the correct answer
What determines the intensity of sound?
Wavelength - C |
Wave frequency - A |
Wave amplitude - D |
Wave speed - B |
Click here to show solution Choose the correct answer
What is the Doppler effect?
Reflection of sound waves - C
|
Interference of two sound - A
|
Change in observed frequency due to - D
|
Change in sound speed with change in medium - B |
Click here to show solution Choose the correct answer
What is the basic condition for forming standing waves in an air column?
Tube length must be proportional to half - C
|
Tube length must equal the sound wavelength - A |
Sound frequency must equal the - D
|
Sound speed in air must be constant - B |
Click here to show solution Choose the correct answer
In a tube open at both ends, how many nodes form at the fundamental frequency?
\[3\;\;\;\;\;\;-C\] |
\[1\;\;\;\;\;\;-A\] |
\[4\;\;\;\;\;\;-D\] |
\[2\;\;\;\;\;\;-B\] |
Click here to show solution Choose the correct answer
What is the fundamental frequency of a tube closed at one end with length 1 meter if the speed of sound is \[v=340\;m/s\]
\[f=255\;\;HZ\;\;\;\;\;\;-C\] |
\[f=170\;\;HZ\;\;\;\;\;\;-A\] |
\[f=340\;\;HZ\;\;\;\;\;\;-D\] |
\[f=85\;\;HZ\;\;\;\;\;\;-B\] |
Click here to show solution Choose the correct answer
If the length of a tube open at both ends is 0.5 meters, what is the wavelength of the fundamental frequency? If the speed of sound is \[v=340\;m/s\]
\[λ=1.5\;\;m\;\;\;\;\;\;-C\] |
\[λ=0.5\;\;m\;\;\;\;\;\;-A\] |
\[λ=2\;\;m\;\;\;\;\;\;-D\] |
\[λ=1\;\;m\;\;\;\;\;\;-B\] |
Click here to show solution Choose the correct answer
At the beginning of a symphony, the sound intensity level was
\[10 \;\;dB\] and rose to
\[70 \;\;dB\]
The pressure level increased by
6 times - C |
1000 times - A |
100000 times - D |
60 times - B |
Click here to show solution Choose the correct answer
An ambulance emits a sound with frequency
\[250 \;HZ\] while moving at speed
\[40\;m/s\] in still air where the speed of sound is
\[344\;m/s\]. What frequencies are observed by a person inside a car moving behind the ambulance in the same direction at speed
\[20\;m/s\]
\[f_d=250\;\; HZ\;\;\;\;\;\;-C\] |
\[f_d=211\;\; HZ\;\;\;\;\;\;-A\] |
\[f_d=237\;\; HZ\;\;\;\;\;\;-D\] |
\[f_d=200\;\; HZ\;\;\;\;\;\;-B\] |
Click here to show solution Choose the correct answer
An ambulance emits sound at a certain frequency, and there is a red car, a black car, and a man standing by the road
with the speed and direction of each car shown in the figure
Arrange the pitch from highest to lowest heard by each of
the ambulance driver, the red car driver, the black car driver, and the man
\[ fD>fC>fB>fA\;\;\;\;\;\;-C\] |
\[fA>fC>fA>fB \;\;\;\;\;\;-A\] |
\[fC>fA>fB>fD\;\;\;\;\;\;-D\] |
\[ fC>fD>fA>fB\;\;\;\;\;\;-B\] |
Click here to show solution Choose the correct answer
A tube closed at one end produced a fundamental frequency of standing wave resonance
\[f_1=200\;HZ\]. Which of the following frequencies cannot be a standing wave resonance for this tube?
\[f=1400\;\; HZ\;\;\;\;\;\;-C\] |
\[f=200\;\; HZ\;\;\;\;\;\;-A\] |
\[f=600\;\; HZ\;\;\;\;\;\;-D\] |
\[f=400\;\; HZ\;\;\;\;\;\;-B\] |
Click here to show solution Choose the correct answer
A tube closed at one end and containing air, when excited, produces a fundamental tone with frequency
\[f_0=210\;HZ\]. If the same tube is open at both ends and contains air
then the fundamental frequency that can be excited is (in Hz)
\[f_1=420\;\; HZ\;\;\;\;\;\;-C\] |
\[f_1=105\;\; HZ\;\;\;\;\;\;-A\] |
\[f_1=630\;\; HZ\;\;\;\;\;\;-D\] |
\[f_1=210\;\; HZ\;\;\;\;\;\;-B\] |
Click here to show solution Choose the correct answer
A tube closed at one end was placed in front of a tuning fork and standing waves were obtained
The air inside the tube was heated and at a certain temperature another standing wave was obtained
By studying the wave properties, one of the following answers is correct
Speed decreases – Frequency constant - C
|
Speed decreases – Frequency increases - A
|
Speed increases – Frequency decreases - D
|
Speed increases – Frequency constant - B
|
Click here to show solution Choose the correct answer
Solve the following problems
A tube open at both ends with length
\[0.6 \;\; m\] had a tuning fork placed in front of it and a standing wave formed
A tube closed at one end with length
\[0.5 \;\; m\] had a tuning fork placed in front of it and a standing wave formed
containing three nodes and four antinodes. If the speed of sound in air is
\[v=340\; m/s\]
Calculate the wavelength of the standing wave
\[.........................................\;\;\;\;\;\;....................................\]
\[........................................\;\;\;\;\;\;....................................\]
Calculate the frequency of the standing wave
\[.........................................\;\;\;\;\;\;....................................\]
\[........................................\;\;\;\;\;\;....................................\]
Calculate the fundamental frequency
\[.........................................\;\;\;\;\;\;....................................\]
\[........................................\;\;\;\;\;\;....................................\]
Click here to show solution
containing four nodes and three antinodes. If the speed of sound in air is
\[v=340\; m/s\]
Calculate the wavelength of the standing wave
\[.........................................\;\;\;\;\;\;....................................\]
\[........................................\;\;\;\;\;\;....................................\]
Calculate the frequency of the standing wave
\[.........................................\;\;\;\;\;\;....................................\]
\[........................................\;\;\;\;\;\;....................................\]
Calculate the fundamental frequency
\[.........................................\;\;\;\;\;\;....................................\]
\[........................................\;\;\;\;\;\;....................................\]
Click here to show solution
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