Sound

Question 1

Definition of Sound

Answer 1

Sound is a form of energy and is produced due to vibrations

Question 2

Audibility range of humans

Answer 2

Humans can hear sound between 20 and 20000hz
below 20hz is subsonic
Above 20000hz is ultrasonic
As we age our audible range lowers
Humans produce sounds between 60-13000hz

Question 3

Supersonic

Answer 3

When a body is said to be travelling at a greater speed than that of sound

Question 4

Characteristics of sound

Answer 4

Sound requires a medium to travel through (solid, liquid, gas)
[in space when astronauts radiophones stop working they touch helmets and talk, the helmets act as a medium for the sound to travel through]
Sound travels fastest in solids and slowest in gas (the denser the medium the faster sound travels)

Question 5

wavelength

Answer 5

The distance between any one point on a wave and the equivalent point on the next

Question 6

Amplitude

Answer 6

The maximum distance a point moves from its rest position when a wave passes

Question 7

Transverse Waves

Answer 7

A transverse wave is a wave in which particles move perpendicular to the direction of the wave
Amplitude is the height of one crest or trough
Crest is the upper wave
Trough is the lower wave
The distance covered in time period is also wavelength

Question 8

Compression

Answer 8

the region in which air layers are pushed closer together

Question 9

Rarefractions

Answer 9

The region in which air molecules are pushed further apart

Question 10

Frequency

Answer 10

The number of waves oscillating at any point per second

Question 11

Longitudinal Waves

Answer 11

When the particles of the medium move parallel to the direction of propagation of the wave.
When the oscillations are backwards and forwards

Question 12

Transverse Waves

Answer 12

When particles in a medium move perpendicular to the direction that the wave is travelling in.
when the oscillations are up and down or side to side

Question 13

Factors that effect the speed of sound

Answer 13

speed of sound depends on the temperature of the air(faster in hot air)
doesnt depend on the pressure of air
Speed of sound is different through materials

Question 14

Rarer to denser

Answer 14

Different Medium:
Speed Increases
Wavelength Increase
Frequency remains the same

Same Medium:
speed decreases
wavelength decrease
Frequency remains the same