Sound

Question 0

Sound needs a medium

Answer 0

We can put an alarm clock or buzzer inside a bell jar and connect it to a vacuum pump as the air is removed the sound becomes fainter
Sound needs a medium in which to travel

Question 1

What is sound

Answer 1

Sound is a form of energy
Sound can travel through a solid a liquid or a gas
It cannot travel through a vacuum

Question 2

Speed of sound and air

Answer 2

The speed of sound in air is 340m/s light is 3x10to the power of eight m/s this is why we see lightning before we hear thunder even though they happen at the same time

Question 3

Echo

Answer 3

Reflection of sound

Question 4

Ultrasound

Answer 4

Is above our level of hearing

Question 5

Ear protection

Answer 5

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

Question 6

Permanganate ear damage

Answer 6

Sounds above 115db

Question 7

Energy conversions and hearing

Answer 7

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

Question 8

Loud sounds

Answer 8

Intensity levelled in dbs sound level meter is used