Sound

Question 0

Sound needs a medium

Answer 0

Put an alarm or buzzer into 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.it is produced by vibrations (vocal chords, air molecules,ear drums) sound can travel through a solid, a liquid,or a gas. It cannot travel through a vacuum therefore it needs a medium to travel through.

Question 2

Speed of sound and air

Answer 2

The speed of sound in air is 340 m/s light is 3x10(to the power of 8) m/s. This is why we see lightening before we hear the thunder even though they happen at the same time.

Question 3

Echoes

Answer 3

Is a reflection of sound

Question 4

Ultrasound

Answer 4

Sound above our 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 protection)

Question 6

Permanent ear damage

Answer 6

Sounds above 115 db

Question 7

Energy conversion in hearing

Answer 7

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

Question 8

Loudness

Answer 8

Of a sound is called he sound intensity level

Question 9

Sound intensity

Answer 9

Is measured in db (decibels)

Question 10

A sound level meter

Answer 10

Is used to measure the loudness of a sound in decibels