Sound waves

Question 1

What is a longitudinal wave?

Answer 1

A wave in which particles of the medium vibrate parallel to the direction of motion.

Question 2

What is a compression?

Answer 2

A region of high pressure where the particles are close together.

Question 3

What is rarefaction?

Answer 3

a region of low pressure and the particles are far apart

Question 4

What is reflection?

Answer 4

reflection of sound is also known as an echo.

Question 5

Which medium does sound move better in?

Answer 5

Solids

Question 6

Name 2 factors that contributes to the speed and sound of a wave?

Answer 6

The density of the wave and the elasticity of the wave

Question 7

Dose light need a medium to travel through?

Answer 7

No

Question 8

What is pitch?

Answer 8

How high or low a sound is

Question 9

What is pitch directly proportionate to?

Answer 9

Pitch is directly proportionate to frequency

Question 10

What is loudness?

Answer 10

Volume

Question 11

What is loudness proportionate to?

Answer 11

Amplitude

Question 12

If a sound is louder what impact will it have on compressions and rarefactions?

Answer 12

There will be more compressions and rarefactions

Question 13

What is sound measured in?

Answer 13

Decibels (dB)

Question 14

What type of a pattern does a pure note give?

Answer 14

A regular pattern

Question 15

What type of a pattern does an impure note give?

Answer 15

An irregular wave pattern

Question 16

What is the meaning of ultrasound?

Answer 16

Sounds above 20Hz to 20 000Hz

Question 17

Name 4 uses of ultrasound.

Answer 17

1. bats and dolphins use it to hunt for their prey
2. Ships use it to identify unknown objects in the water
3. To diagnose and treat illnesses
4. To check pregnancies