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Sound
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1994-08-31
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109 lines
@What is the unit of frequency?
Hertz
Metre
Metres per second
@What is the unit of wavelength?
Metre
Hertz
Second
@If the volume control on a radio is turned up the sound waves have a larger:
Amplitude
Frequency
Wavelength
@Which one of the following converts electrical energy to sound energy?
Loudspeaker
Microphone
Oscilloscope
@Which one of the following devices converts sound to electrical energy?
Microphone
Loudspeaker
Dynamo
@What is the unit of velocity of a sound wave?
Metres per second
Hertz
Metre
@A tuning fork vibrates at 165 times a second. If the velocity of sound waves is 330m/s, what is the wavelength?
2m
54,450m
165m
@Which ONE of the following is true?
Sound travels slower than light
Sound and light travel at the same speed
Sound travels faster than light
@Which of the following is TRUE for sound waves travelling through different materials?
They travel through solids, liquids & gases
They do not travel through gases
They do not travel through solids
@Why would an astronaut in space be unable to hear an explosion he has just seen?
Because there is no atmosphere in space
Because light travels faster than sound
Because all the sound energy is absorbed in the explosion
@What range of frequencies (approximately) can be heard by the human ear?
20 - 20,000 Hz
2 - 2,000 Hz
2,000 - 20,000 Hz
@Which of the following is true?
Sound travels faster in water than in air
Sound does not travel through water
Sound travels slower in water than in air
@Ships use pulses of sound (sonar) to find the depth of water below them. The system used is:
Sending a pulse and timing how long it takes to return
Sending several pulses and seeing how many return
Gradually sending weaker pulses until they can just be detected
@What is ultra-sonic sound?
Sound waves of a very high frequency
Very quick moving sound waves
Long wavelength sound waves
@The loudness of a sound depends on its:
Amplitude
Speed
Frequency
@A boat uses sonar to find the depth of the sea below it. How is the echo produced?
#sonar
Sound is reflected off the seabed
Refraction of the sound wave in water
Interference effects
@A boat uses sonar to find the depth of the sea below it. If a shoal of fish swims under the boat then:
#sonar
An echo is received from the fish and the seabed
The echo is not affected in any way
The echo is refracted so that it does not return to the boat
@A boat uses sonar to find the depth of the sea below it. The reflected pulse:
#sonar
is weaker than the sent pulse
will be stronger than the sent pulse
must be the same strength as the sent pulse to work properly
@A boat uses sonar to find the depth of the sea below it. The speed of sound in water is:
#sonar
faster than in air
slower than in air
exactly the same as in air
@Thunder and lightning can only be heard and seen at the same time when:
a storm is directly overhead
the storm is moving away
as the storm approaches you
Sound travels at 330m/s. How far away from a large wall should you stand to hear an echo 1s later?
115m
330m
660m