Topic 3.4 Sound Flashcards Preview

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Flashcards in Topic 3.4 Sound Deck (16)
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1

What are sound waves?

  • Sound waves are longitudinal waves.

  • Sound is produced by the vibration of particles in a medium (the substance that waves travel through).

  • The vibrations mean that sound waves travel in a series of compressions (where the medium is squashed together) and rarefactions (where the medium is stretched apart).

2

How does sound travel through solids?

Sound waves cause vibrations through the solid.

3

What type of waves are sound waves?

Longitudinal waves.

4

Can sound travel through a vacuum?

No, sound requires a medium to be transmitted.

5

What is an echo?

A reflected sound wave

6

What is the speed of sound in air?

343 m/s

7

What is the speed of sound in steel?

5130 m/s

8

How does the speed of sound compare in solids, liquids and gases?

It is fastest in solids and slowest in gases.

9

What is the range of frequencies audible to the human ear?

20 Hz - 20kHz

(20-20000Hz)

10

What is ultrasound?

Sound with a frequency higher than 20kHz.

11

Describe the features of a longitudinal wave.

Longitudinal waves have compressions and rarefactions.

12

What wave property affects the volume of sound?

The amplitude (greater amplitude = louder sound).

13

What wave property affects the pitch of sound?

The frequency (higher frequency = higher pitch).

14

Describe applications of ultrasound

Ultrasound is used largely in medical imaging, specifically pregnancy scanning, as it is non-ionising so it does not increase the risk of cancer.

15

How would you do an experiment to determine the speed of sound in air?

You would need:

  • Source of sound (starter pistol)
  • Measuring tape
  • Stopwatch

Readings you would take:

  • Distance and time between flash and bang 

How would you calculate the speed:

  • You would calculate the speed by using distance/time 

How to make it more accurate: 

  • Repeats

16

Draw a diagram showing compressions and rarefactions and label the wavelength