Sound

Question 1

What is amplitude?

Answer 1

The maximum distance of a vibration the object moves from its resting position

Question 2

What is frequency?

Answer 2

Frequency is the number of vibrations per second

Question 3

How to find the total number of vibrations?

Answer 3

Time x Frequency = Total number of vibrations (Hz)

Question 4

How is a sound wave created?

Answer 4

Air is made up of tiny particles which are called molecules, these molecules travel side to side creating a sound weave

Question 5

How is sound measured?

Answer 5

A microphone connected to the oscilloscope can be used to see sound waves on the screen as a line. The line is called a trace

Question 6

How do we hear?

Answer 6

1. Vibrations travel down the ear canal
2. The vibrating air pushes on the ear canal so it vibrates
3. The ear canal pushes the three bones so they vibrate
4. The smallest bone vibrates against the cochlea, which is a curled-up tube filled with liquid
5. The vibrations travel through the liquid, stimulating the none cells inside the cochlea. This sends electrical signals to the brain

Question 7

Range of hearing?

Answer 7

20-20,000Hz(Aged under 20)
20-15,000Hz(Aged 50 above)
Sounds above 20,000 are beyond range of human beings, there called ultra sounds