Sound

Question 1

How is sound produced?

Answer 1

vibrating sources

Question 2

Are sound waves transverse or longitudinal?

Answer 2

longitudinal

Question 3

What is the approximate range of frequencies audible to humans?

Answer 3

20 Hz to 20 000 Hz

Question 4

Is a medium necessary or not to transmit sound waves?

Answer 4

yes

Question 5

What is the speed of sound in air?

Answer 5

approximately 330-350 m/s

Question 6

Which state of matter does sound travel faster in?

Answer 6

solids

Question 7

Which state of matter does sound travel slower in?

Answer 7

gases

Question 8

What is an echo?

Answer 8

reflection of sound waves

Question 9

What is ultrasound?

Answer 9

sound with a frequency higher than 20 kHz

Question 10

What are uses of ultrasound?

Answer 10

non-destructive testing of materials
medical scanning of soft tissue and sonar

Question 11

What are compressions?

Answer 11

regions of air (or another material) where particles are compressed closer together than normal due to the passing of a sound wave

Question 12

What are rarefactions?

Answer 12

regions of air (or another material) where particles are spread out further than normal due to the passing of a sound wave