P12.5 Sound waves

Question 1

What happens if you increase the loudness of a wave?

Answer 1

It increases the amplitude of the wave

Question 2

What is the range of frequencies humans can hear?

Answer 2

20 Hz to about 20 000 Hz

Question 3

Why is the frequency of the human ear limited?

Answer 3

Because when sound waves enter a solid it is converted to vibrations.
The conversion of sound waves to vibrations of solids only work for a limited frequency range

Question 4

What is echo sounding?

Answer 4

Using pulses of high-frequency sound waves to detect objects in deep water and to measure water depth

Question 5

How does Echo sounding work?

Answer 5

Pulses from the transmitter are reflected at the sea bed directly below the ship and detected by a receiver at the same depth as the transmitter
The time taken by each wave to travel to the sea bed and back is measure
Total distance travelled Is speed x time
So the depth of water is 1/2 x v x t

Question 6

How does the human ear work?

Answer 6

Sound waves cause the ear drum to vibrate and the vibrations send signals to the brain