Paper 2 - Waves Flashcards

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1
Q

What is the frequency range for human hearing?

A

20Hz - 20,000Hz

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2
Q

Describe a practical to investigate the speed of sound in air?

A
  • Person 1 and Person 2 stand 100 meters from each other (measured with a trundle wheel)
  • Person 1 has 2 wooden blocks and Person 2 has a stopwatch
  • When person 2 sees person 1 hit the blocks together, they start the stopwatch, when they hear the wooden blocks collide they stop it.
  • Then use the equation s=d / t to work out average speed
  • Repeat 3 times and take an average
  • Repeat the experiment at different distances such as 120, 140, 160 and 180 meters
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3
Q

How can an oscilloscope and microphone be used to display a sound wave?

A
  • Microphone detects sound waves and turn them into an electrical signal
  • Oscilloscope will display the electrical signal as a transverse wave with voltage plotted against time
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4
Q

How does the pitch of a sound relate to frequency of vibration of the source?

A

-The higher pitch, the more oscillations per second
- Waves have a shorter wavelength
- Waves have a higher frequency

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5
Q

How does the loudness of a sound relate to the amplitude of vibration of the source?

A
  • The louder the sound, the larger the amplitude
  • So the waves have a larger negative and positive amplitude
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