Sound

Question 1

What is sound

Answer 1

A form of energy produced when objects vibrate, that is transferred in waves

Question 2

Give two examples of sounds made by vibrations

Answer 2

A guitar string

A vibrating ruler on the edge of a table

Question 3

Explain how sound travels

Answer 3

Object/vocal chords vibrate to produce a sound
Air molecules around it vibrate
Vibration energy passes through air molecules so they vibrate
Wave of vibration energy reaches eardrum and it vibrates aswell
Energy to eardrum allows for sound to be heard

Question 4

What does sound need to travel

Answer 4

A medium to pass through

Question 5

Explain an experiment to show that sound needs a medium to pass through

Answer 5

Place an electric bell into a bell jar. And using a vacuum pump while the bell is ringing gradually begin to suck the air from the jar
The bell will gradually sound fainter and then will not be heard because sound has no medium to pass through

Question 6

How is an echo produced

Answer 6

Sound is reflected off smooth hard surfaces such as a wall

Question 7

What is the speed of sound and the speed of light in m/s

Answer 7

Sound:340m/s
Light:300,000,000m/s

Question 8

Give an example of the comparison of speed of sound to speed of light

Answer 8

Fireworks, you see the lights before you hear the explosion

Question 9

Explain the frequency of a sound wave

Answer 9

How fast a sound wave is moving. Faster the sound moves the higher the pitch

Question 10

Explain the amplitude of a sound wave

Answer 10

Determines the loudness of the sound

Question 11

How is sound level measured and what is the loudest level of sound that can be listened to(pain threshold)

Answer 11

Measured in decibels (dB)
Highest:120dB
Above 85dB is damaging