Chapter 3: Waves (Pt.4)

Question 1

How are sound waves produced?

Answer 1

produced by the vibrating motion of the particles that travel through a conductive medium

Question 2

What type of waves are sound waves?

Answer 2

longitudinal waves

Question 3

What do sound waves consist of?

Answer 3

areas of high and low pressure called compressions and rarefactions.

Question 4

What are compressions and rarefactions?

Answer 4

compressions: where the medium is compressed
rarefactions: where the medium is spread out

Question 5

Tell me the range of frequencies of sound humans can hear?

Answer 5

20 Hz - 20000 Hz

Question 6

What is ultrasound?

Answer 6

Sound waves that have a frequency higher than the upper audible limit of human hearing.

Question 7

Tell me the speed of sound in air.

Answer 7

343 m/s

Question 8

Tell me the speed of sound in water.

Answer 8

1484 m/s

Question 9

Tell me the speed of sound in copper.

Answer 9

6420 m/s

Question 10

Tell me the speed of sound in steel.

Answer 10

5940 m/s

Question 11

What is the amplitude?

Answer 11

The size of the vibration, which states how loud the sound is.
Larger vibrations make a larger sound

Question 12

What is loudness expressed in?

Answer 12

Decibals

Question 13

What does the pitch and the tone of voice depend on?

Answer 13

The frequency of vibrations

Question 14

What is frequency expressed in?

Answer 14

Hertz

Question 15

What is an echo?

Answer 15

A reflected sound wave which reaches the listener after a delay after the direct sound.

Question 16

List the uses of ultrasound.

Answer 16

1. Breaking kidney stones
2. Cleaning jewellery
3. Foetal Scanning
4. Detecting cracks in machinery

Question 17

Answer 17