Chapter 13: Sound

Question 1

What is sound?

Answer 1

A form of energy that is transferred from one point to another as a longitudinal wave

Question 2

What is compressions?

Answer 2

Regions where air pressure is higher than the surrounding air pressure

Question 3

What is rarefactions?

Answer 3

Regions where air pressure is lower than the surrounding air pressure

Question 4

Transmissions of sound

Answer 4

Speed of sound in gas < Speed of sound in liquid < Speed of sound in solid

Question 5

What is an echo? Uses?

Answer 5

The repetition of a sound due to the reflection of sound

Measures large distances
Detect the location of objects

Question 6

What is pitch?

Answer 6

Pitch is related to the frequency of a sound wave
Higher pitch, higher frequency
More wave, higher pitch

Question 7

What is loudness?

Answer 7

Loudness is related to the amplitude of a sound wave
The larger the amplitude, the louder the sound
Higher amplitude, more loud

Question 8

Reverberation

Answer 8

Reflected sounds that cannot be heard as separate sounds but prolong with the original sound

Question 9

Vacuum pump switched on

Answer 9

When the vacuum pump is switched on, the sound of the bell becomes softer and softer until you can no longer hear it

Question 10

Why is the electric bell hung by rubber bands

Answer 10

Rubber band is a soft material which can absorb vibrations of the bell. This minimises the transmission of sound through other mediums than air