Sound

Question 0

Sound needs a medium

Answer 0

Put an alarm clock inside a bell jar and connect it to a vacuum pump.as the air is removed the sound becomes fainter.so sound needs a medium to travel.

Question 1

Sound

Answer 1

Is a form of energy.is produced by vibrations and sound can travel through a solid a liquid and a gas.

Question 2

Speed of sound in air

Answer 2

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

Question 3

Echo

Answer 3

Is reflection of sound

Question 4

Ultra sound

Answer 4

Sound above our level of hearing(20,000hrz)

Question 5

Ear protection

Answer 5

If people are working in a job with 70db(decibel)they have to wear ear protection

Question 6

Permanent ear damage

Answer 6

Sounds above 115 decibels

Question 7

Energy conversions in hearing

Answer 7

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

Question 8

Loudness

Answer 8

Of a sound is called intensity level

Question 9

Sound intensity

Answer 9

Is mesic red in decibels

Question 10

A sound level meter

Answer 10

Is used to measure the loudness of a sound in decibels