Starter quiz
- What does a loudspeaker do when it makes a louder sound?
- vibrates in and out more slowly
- vibrates in and out more quickly
- vibrates in and out a bigger distance ✓
- vibrates in and out a smaller distance
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- What causes a soundwave to have a bigger amplitude?
- a bigger vibration ✓
- a smaller vibration
- a faster vibration
- a slower vibration
-
- What sort of sound has a bigger amplitude?
- a louder sound ✓
- a quieter sound
- a sound with a higher note
- a sound with a lower note
-
- What does a loudspeaker do when it makes a higher pitched sound?
- vibrates in and out more slowly
- vibrates in and out more quickly ✓
- vibrates in and out a bigger distance
- vibrates in and out a smaller distance
-
- What causes a sound to have a lower frequency?
- a bigger vibration
- a smaller vibration
- a faster vibration
- a slower vibration ✓
-
- What sort of sound has a higher frequency?
- a louder sound
- a quieter sound
- a sound with a higher note ✓
- a sound with a lower note
-
Exit quiz
What sort of graph is shown on an oscilloscope?- a displacement-distance graph
- a displacement-time graph ✓
- a distance-time graph
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- What type of sound causes the height of a graph on an oscilloscope to increase?
- quieter sound
- louder sound ✓
- higher pitched (squeakier) sound
- lower pitched (deeper note) sound
-
- What type of sound causes the length of wave on a graph on an oscilloscope to increase?
- quieter sound
- louder sound
- higher pitched (squeakier) sound
- lower pitched (deeper note) sound ✓
-
- What is the distance between two wave crests on an oscilloscope graph equal to?
- amplitude
- frequency
- period ✓
- wavelength
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- An oscilloscope shows two complete waves on a screen and it takes 0.1 s for the line to move across the screen. What is the period of the wave?
- 0.5 s
- 0.2 s
- 0.1 s
- 0.05 s ✓
- 0.02 s
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- The period of a wave is 0.05 s. How many complete waves are seen on the screen of an oscilloscope if it takes 0.2 s for the line to move across the screen?
- 0.2
- 2.5
- 4 ✓
- 10
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- An oscilloscope is a displacement-time graph of a wave
- Connected to a microphone, an oscilloscope shows a displacement-time graph of a sound wave
- The distance between two wave crests on an oscilloscope’s graph is equal to the period of the wave
- The time period is measured most accurately by measuring the time for, say, 10 waves and dividing time by 10
- The bigger the amplitude of a sound wave, the louder the sound
Common misconception
The distance between two crests of an oscilloscope graph is equal to one wavelength.
Emphasise the need to read scales of graphs first and that the horizontal scale of an oscilloscope graph is time.
Keywords
Oscilloscope - an oscilloscope is a piece of equipment that can display a representation of a sound wave.
Displacement-time graph - a displacement-time graph shows how the displacement of one part of a wave changes as the wave moves forward.
Period - the period of a wave is the time for one complete oscillation.
Frequency - the frequency of a wave is the number of complete oscillations in one second.
Loudness - the loudness of a sound wave is a measure of how loud it is.
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