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

Question 1

Sound

Answer 1

Sound is a form of energy produced by vibrations and can travel through a solid,liquid or a gas but cannot travel through a vacuum

Question 2

Speed of sound in air

Answer 2

Speed of sound in air is 340m/s light is 3by10to the power of 8m/s this is why we see lightning before we hear thunder

Question 3

Echo

Answer 3

Reflection of sound

Question 4

Ultrasound

Answer 4

Sound above level of hearing

Question 5

Ear protection

Answer 5

If people are working in a job where sound is above 70db (decibels) they have to wear ear protection (busy street traffic)

Question 6

Energy conversion in hearing

Answer 6

The movement (kinetic) energy is converted to electrical energy and goes to the brain to be processed

Question 7

Loudness

Answer 7

The loudness of a sound is called the sound intensity level

Question 8

Sound intensity

Answer 8

Sound intensity is measured in decibels

Question 9

Sound level meter

Answer 9

A sound level meter is used to measure the loudness of a sound in decibels