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- @What is the unit of frequency?
- Hertz
- Metre
- Metres per second
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- @What is the unit of wavelength?
- Metre
- Hertz
- Second
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- @If the volume control on a radio is turned up the sound waves have a larger:
- Amplitude
- Frequency
- Wavelength
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- @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
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- @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
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- @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
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- @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
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- @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 frequencyÂ
- 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
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- @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
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- Sound travels at 330m/s. How far away from a large wall should you stand to hear an echo 1s later?
- 115m
- 330m
- 660m
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