Sound Characteristics

Question 1

When the air molecules come close to each other, they form areas of high pressure

Answer 1

condensation/compressions

Question 2

When the molecules set apart from each other, they form areas of low pressure

Answer 2

rarefactions

Question 3

These alternating areas of successive condensations and rarefactions (alternating areas of high & low pressure) generate

Answer 3

“The sound wave”

Question 4

The outermost wave in this sphere is

Answer 4

wave front

Question 5

What propagate or travel is

Answer 5

the disturbance in the environment, not the air molecules

Question 6

meaning that the motion of particles is along the direction of propagation

Answer 6

Sound is a longitudinal wave

Question 7

the motion of the particles is perpendicular to the direction of propagation

Answer 7

Transverse waves

Question 8

The sound wave that propagates and travels a certain distance is

Answer 8

incident wave

Question 9

When sound waves travel through any medium, one or more of the following phenomena may occur

Answer 9

Transmission, Absorption, Reflection, Refraction.

Question 10

When a sound wave enters another medium, there is transmission of the wave in the medium. A sound wave in air can be transmitted through a wall in a house. Or sound can enter water and be transmitted in the liquid.
Sound waves travel faster in solid than liquids and in liquids than air

Answer 10

Transmission

Question 11

As sound travels through any medium, there is some loss due to absorption. Since sound is a regular vibration of the atoms or molecules in a material, some of the kinetic energy of the waveform is lost due to molecular collisions (friction). That sound energy is turned into random heat energy.

Answer 11

Absorption

Question 12

When a wave bounces off an object and changes direction – this is

Answer 12

reflection

Question 13

the bending of a wave as it passes from one medium to another.

Answer 13

Refraction

Question 14

occurs in a situation where there are reflected waves meet with on going incident waves

Answer 14

Interference

Question 15

An increase sound pressure at a particular point

Answer 15

constructive interference

Question 16

A decrease in the sound pressure

Answer 16

Destructive interference

Question 17

an acoustic phenomenon resulting from multiple reflected sound waves occur and reach the listener’s ear with minimal time delay in comparison to the incident sound waves

Answer 17

Reverberation

Question 18

is an exaggerated form of reverberation.It occurs when the delay can be noticeable and the distance between the reflected surface and the listener’s ear is substantial

Answer 18

Echo

Question 19

the environment in which the sound waves travel

Answer 19

Sound fields

Question 20

There are no boundaries or barriers
Sound waves propagate indefinitely
No reflection, no diffraction, or transmission (no obstacles)

Answer 20

Free field

Question 21

Anechoic chamber (no echo)

Answer 21

anechoic and soundproof (no reflection or transmission)

Question 22

Obtained in reverberant room at relatively great distance from the sound source

Answer 22

Diffuse sound field

Question 23

several wave lengths away from the sound source

Answer 23

far field

Question 24

distances of less than a few wave lengths from the sound source

Answer 24

Near field