Sound

Question 0

Sound needs a medium

Answer 0

Put an alarm clock or buzzer inside a bell jar and connect it to a vacuum pump.
As air is removed , the sound becomes fainter .
Conclusion = sound needs a medium in which to travel.

Question 1

Sound

Answer 1

Is a form of energy
Produced by vibrations
Sound can travel through a solid liquid or gas
It can not travel through a vacuum

Question 2

Speed of sound and air

Answer 2

The sped of sound in air is 340m/s , light is 3✖️10 to the power of 8 . This is why we see lightening befor we hear thunder

Question 3

Echoes and ultrasounds

Answer 3

An echo is a reflection of sound
Ultrasound is sound above are level of hearing
Echoes & ultrasound have a lot of uses
Pregnant mothers can get a picture of their baby
Bats can find their way

Question 4

Ear protection

Answer 4

If people are working in a job where sound is above 70db they have to wear ear protection

Question 5

Permanent ear damage

Answer 5

Sound over 115db can cause permanent damage

Question 6

Energy conversions in hearing

Answer 6

The movement kinectic energy is converted to electrical energy and goes to the brain to be processed

Question 7

Loud sounds

Answer 7

The loudness of a sound is called the sound intensity level .
Sound intensity is measured in decibels .
A sound level meter is used to measure the loudness of sound in decibels .