Sound

Question 1

How is sound made?

Answer 1

Sound is made when an object vibrates.

Question 2

What is the unit for a humans hearing range?

Answer 2

Hertz - Hz

Question 3

What is the average hearing range a young healthy person has?

Answer 3

20Hz to 20,000Hz

Question 4

(T or F) Frequency relates to pitch

Answer 4

True

Question 5

(T or F) Amplitude relates to volume

Answer 5

True

Question 6

What happens to the sound of the wave created when the frequency is increased?

Answer 6

As the frequency increases, the wave length decreases, and in turn causes the pitch to be higher

Question 7

What happens to the sound of the wave created when the amplitude increases?

Answer 7

As the amplitude of the wave increases, the volume also increases.

Question 8

(T or F) Sound travels at the same speed in different type of mediums.

Answer 8

False, sounds travels faster/slower in certain mediums.

Question 9

In what medium does sounds travel fastest and why?

Answer 9

Sound travels fastest in a solid because the transfer of energy that occurs when participles bump into each other is more apparent in a solid as the particles are tightly packed and close together.

Question 10

Complete the sentence - The vibrations of the object are (1)………. the medium as a series of (2)……….

Answer 10

(1) passed through/transmitted through
(2) compressions

Question 11

(T or F) Sound needs a medium to travel through. If True, explain why.

Answer 11

True, sound needs a medium to travel through because the vibrations need to be passed on. This happens by particles bumping into each other, causing the wave to travel.

Question 12

How do humans hear sound?

Answer 12

(1) Sound waves enter the ear canal, making the ear drum vibrate.
(2) The vibrations are transmitted through tiny bones in the middle ear.
(3) In the cochlea, hair cells convert the vibrations into electrical signals which are then sent to the brain, via the auditory nerve, for interpretation