Test Sound and Waves
Which of the following would decrease the frequency of a pendulum
Increasing the mass of a bob
Increasing the length
Decreasing amplitude
Reducing air resistance
What type of wave does the diagram illustrate
Transverse
Longitudinal
Torsional
Complex
Which of the following materials would be fastest at transferring vibrations
Lead
Aluminum
Air
Water
What term do we use to describe objects travelling faster than the speed of sound?
Infrasonic
Ultrasonic
Subsonic
Supersonic
The distance between two points oscillating in phase is called ...
Amplitude
Wavelength
Period
Crest
Which property of waves describes the bending effect of a wave as it enters a new medium
Transmission
Reflection
Refraction
Diffraction
When a standing wave is produced, what is happening at the nodal point?
The original and reflected wave destructively interfere
The original and reflected wave constructively interfere
The energy of the original wave is lost
The energy of the reflected wave is lost
What is the frequency of the heart when it beats 90 times per minute
90Hz
1.5Hz
0.67Hz
0.011Hz
What causes audible beats to be produced
Two sound waves that differ by a large change in their amplitude
Two sound waves that differ by a sight change in their amplitude
Two sound waves that differ by a large change in their frequencies
Two sound waves that differ by a slight change in their frequencies
Which of the following will lower the frequency of a percussion instrument
Larger diamater
Increasing its tension
Decreasing its thickness
Decreasing its density
Why can you not hear an explosion on the moon?
The speed of sound is extremely slow
There is no medium to transmit sound
The insulation of space suit dampen sound
The frequency of the explosion is above the human hearing range
A firetruck's siren has a frequency of 2000 Hz. As it approaches you with a velocity of 90km/h what frequency do you hear if it is only 5°C outside?
1576.5 Hz
1861.1 Hz
2161.3 Hz
2734.7 Hz
Scientists have found that the long slow moan produced by whales is almost consistently a B pitch at a frequency of 15 Hz. The wavelength of this note is 100m. How far is the whale from the scientists if its sound takes 6 seconds to reach them
About 9km
About 18km
About 40km
About 250m
What will happen as the following two waves interfere?
The amplitude will add and the resulting wave will have a larger amplitude and the resulting wave will move to the left
The waves will cancel each other out and stop travelling
The amplitudes will subtract and the resulting wave will be smaller in amplitude. The waves will continue moving afterward
The amplitudes will add the resulting wave will have a larger amplitude. The individual waves will continue moving in opposite directions afterwards
Diffraction is the bending of a wave. When would diffraction be at its greatest?
Long waves, small openings
Short waves, small openings
Long waves, large openings
Short waves, large openings
Which of the following factor would not change the speed of sound?
The medium's density
A change in atmospheric pressure
A change in frequency
A change in temperature
Which of the following accurately describes the Doppler effect
As an object emitting a sound approaches an observer, the sound waves expand, so that the observer hears a higher frequency
As an object emitting a sound approaches an observer, the soundw ave expand, os that the observer hears a lower frequency
As an object emitting a sound approaches an observer, the sound waves compressed, so that the observer hears a higher frequency
As an object emitting a sound approaches an observer, the sound waves compressed, so that the observer hears a lower frequency
Which part of the ear do you find the microscopic hairs that vibrate at particular frequencies
Eardrum
Eustachian tunbe
Cochlea
Auditory nerve
For which harmonic would you have a second overtone?
First or fundamental
Second
Third
Fourth
As an object at rest creates a sound wave, what is most likely to change about the wave
Wavelength
Amplitude
Speed
Frequency
Which of the following affects the period of a pendulum?
The mass of a bob
The amplitude of the swing
The length of a string
All of the above
What type of wave is the wave pictured below?
Transverse
Longitudinal
Torsional
Complex
What term do we use to describe frequencies above the human hearing range?
Infrasonic
Ultrasonic
Subsonic
Supersonic
Which of the following factors affect the speed of a wave?
Density of the medium
Temperature
Tension
All of the above
The resonance frequency is best described as the frequency for which ...
There is no more sound
An object natural vibrates
A standing wave is produced
A beat is detected
Which of the following best describes wave interference
Waves collide and their energy disappears
Wave bounces off each other without loss of energy
Waves pass through each other with their amplitudes being added
Waves collide and their amplitudes are inverted
Which of the following best explains why sound is quieter a further distance from the source?
As the sound travels a longer distance it gets dampened because air does not transmit waves very efficiently
As you increase the distance from the source of the sound, more of the sound wave ends up being reflected in different directions causing it to lose energy
At farther distances sound waves interfere with other mechanical waves and lose energy
As you increase the distance from the source of the sound, the area in which the sound wave covers increases, and energy is spread out more
What is a period of a fan blade, which turns at 1200 rotations per minute?
0.0083s
0.05s
20s
1200s
Which of the following will increase the frequency of a stringed instrument
Increasing its length
Decreasing its tension
Decreasing is diameter
Increasing its density
What causes the sound barrier or sonic boom
A very intense sound wave
The build of of sound waves for an object approaching the speed of sound
A large explosion
Ultrasonic sound waves that resonate with an object
The police cruiser has a radar gun attached that sends out waves with a frequency of 40,000 Hz. The frequency of the echo is measured to be 44,000 Hz. What is the speed of the approaching vehicle if the speed of sound is found to be 340m/s
About 1m/s
About 12m/s
About 23m/s
About 31m/s
A resulting wave with an amplitude greater than any of the amplitudes from the initial wave is referred to as
Beat frequency
Constructive interference
Destructive interference
A nodal point
As a wave moves into a slower medium, which of the following will happen?
Amplitude will increase
Wavelength will increase
Amplitude will decrease
Wavelength will decrease
How do the crests of a standing wave compare to that of the original wave?
The crests are equal to that of the original wave
The crests are half of those of the original wave
The standing wave is constantly zero at the antinodes
The crests are twice that of the original wave
What causes audible beats to be produced?
Two sound waves that differ by a large change in their amplitudes
Two sound waves that differ by a slight change in their amplitudes
Two sound waves that differ by a by a large change in their frequencies
Two sound waves that differ by a a slight change in their frequencies
Which is not a method of soundproofing saround the school
Removing furniture
Materials in the wall
Slits in the cement wall
Carpeting the floor
Diffractions of waves happen to decrease when ...
Both the opening and wavelength are small
Both the opening and wave length are large
The opening is small but the wavelength is large
The opening is large but the wavelength is small
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