Phy

Question 0

……… Refers to frequencies below 20Hz

Answer 0

Infrasonic

Question 1

Sound is a…… Wave

Answer 1

Longitudinal

Question 2

……….refers to frequencies above 20kHz

Answer 2

Ultrasonic

Question 3

The…….. Of a sound wave is the energy carried through unit area per second

Answer 3

Intensity

Question 4

The ratio of two sound intensities is usually expressed in…….

Answer 4

Decibels

Question 5

What is the amplitude of displacement of air molecules at the limit of hearing in humans?

Answer 5

One atom

Question 6

The……… Of a tone is a perceived quantity

Answer 6

Loudness

Question 7

Loudness depends on………. And………. Of sound waves

Answer 7

Intensity and frequency

Question 8

What is the unit of loudness?

Answer 8

Phon

Question 9

The………….. Of a medium is defined as Z=pv

Answer 9

Acoustic impedance

Question 10

Materials with similar acoustic impedances is called…….

Answer 10

Impedance matching

Question 11

…………. Occurs at positions where the waves arrive in phase

Answer 11

Constructive interference

Question 12

Antinodes are and example of

Answer 12

Destructive interference

Question 13

What parts make up the outer ear?

Answer 13

The pinna, auditory canal, eardrum

Question 14

What is the resonant frequency of the ear canal?

Answer 14

3400Hz

Question 15

What does the middle ear consist of?

Answer 15

Hammer, anvil and stirrup

Question 16

What does the inner ear consist of?

Answer 16

Fluid filled, spiral shaped cochlea.

Question 17

What does the outer ear do?

Answer 17

Gathers sound waves

Question 18

What does the middle ear do?

Answer 18

Amplifies sound

Question 19

What does the inner ear do?

Answer 19

Hair cells convert the sound vibrations into coded nerve pulses which are transmitted to the auditory cortex of the brain.

Question 20

Define the solid state

Answer 20

Molecules oscillate about more or less fixed centres.

Long range order

Question 21

Define the liquid state

Answer 21

Intermolecular distances and amplitudes are slightly larger than solids. Centres are free to move.
Short range order

Question 22

Define the gas state

Answer 22

Molecules have much greater kinetic energy. Small attractive forces. The

Question 23

Is elasticity reversible?

Answer 23

Yes

Question 24

In stress and strain, force transmitted throughout the object if…….

Answer 24

Stationary

Question 25

Define stress

Answer 25

Force divided by area