Sound

Question 1

What is the speed of sound in Air?

Answer 1

The speed of sound in air is about 330 m/s or 1200 km/h

Question 2

Define Echo

Answer 2

a sound or sounds caused by the reflection of sound waves from a surface back to the listener.

Question 3

Relation between Frequency and Period

Answer 3

One time vibration contains a period (T) of the vibration, it is related to the frequency of the sound.

Frequency = 1/Period

Question 4

Increase of sound

Answer 4

Increasing loudness of the sound → Amplitude increases

Increasing the Pitch of the sound → Frequency increases

Question 5

What is the human hearing range?

Answer 5

HUMAN HEARING RANGE - 20Hz to 20 000Hz

Question 6

Define Ultrasound and Infrasound

Answer 6

Ultrasound - all acoustic energy with a frequency above human hearing (20,000 hertz or 20 kilohertz).

Infrasound - sound below a frequency of 20 Hz

Question 7

Define Compression and Rarefraction

Answer 7

Compression - The areas of sound wave where the air molecules are close together
Rarefaction - The areas of sound wave where the air molecules are less closely packed together, or rarefied.