Waves

Question 1

Vibration or oscillation

Answer 1

Regular,repetitive to and fro up and down motion

Question 2

Wave

Answer 2

Caused by a continuous series of pulses or vibrations

Question 3

Particles in a medium are in phase if they are??????

Answer 3

Vibrating perfectly in step with one another i.e. if they are moving in the same direction and of the same distance away from rest position

Question 4

Wavelength

Answer 4

The distance between two consecutive points which are in phase

Question 5

Frequency

Answer 5

The number of complete waves passing a point in one second

Question 6

Frequency formula

Answer 6

F =1/T

Question 7

Period of a wave

Answer 7

The amount of time taken for one complete wave to pass a point

Question 8

Period formula

Answer 8

T=1/f

Question 9

Speed of a wave

Answer 9

The distance moved by any pulse and a wave in one second

Question 10

Speed of a wave formula

Answer 10

V=🔺x/t

Question 11

The wave equation

Answer 11

V=f x lambda

Question 12

amplitude

Answer 12

Maximum displacement from the position of rest

Question 13

Transverse wave

Answer 13

A wave in which the particles of the medium vibrate at 90° to the direction in which the wave moves

Question 14

Longitudinal wave

Answer 14

A wave in which the particles of a medium vibrate parallel to the direction in which the waves move

Question 15

crest

Answer 15

The maximum displacement above position of rest

Question 16

Trough

Answer 16

The maximum position or displacement below rest position

Question 17

Rest position or equilibrium position

Answer 17

Point at which there is no displacement

Question 18

Compression

Answer 18

Area where particles are close together in a longitudinal wave

Question 19

Rare faction

Answer 19

An area where particles are far apart and a longitudinal wave

Question 20

Wavelength of a longitudinal wave

Answer 20

Measured from the centre of the compression to the centre of the next compression or from the centre of the rare faction to the centre of the next rare faction

Question 21

pulse

Answer 21

A single disturbance in a medium

Question 22

Does destructive interference result in a larger or smaller amplitude and explain the 2 types

Answer 22

Destructive interference occurs when a crest and trough meet this results in a smaller amplitude the first type of destructive interference is partial destructive interference when the weights have different amplitudes there is also total destructive interference when waves have the same attitude and they cancel each other out

Question 23

Principle of superposition

Answer 23

When pulses cross the combine disturbance at any point is equal to the algebraic some of the disturbances

Question 24

Interference

Answer 24

When two or more pulses interact with each other in the same space at the same time

Question 25

Diffraction

Answer 25

When waves past the edge of a barrier or go through a gap they spread out all the bending of the wave around the edges of an obstacle or through a gap

Question 26

Degree of diffraction depends on????

Answer 26

One the size of the gap the smaller bigger the more diffraction to wavelength this bigger the wavelength the more diffraction three size of the object the bigger the object is the more destruction

Question 27

Pitch

Answer 27

How high or low sound is this is relative to its frequency

Question 28

Volume or loudness

Answer 28

How loud or soft a sound is this is relative to its amplitude

Question 29

Noise

Answer 29

Noise isn’t on pleasant sound and is it is a result of an irregular frequency or waveform

Question 30

Sound

Answer 30

A pleasant sound as a result of a regular frequency or wave form

Question 31

Tone

Answer 31

Sound is not monotonic i.e. does not have a single frequency sound propagates sound waves at a basic or fundamental frequency basic frequency is set in motion additional frequency waves of varying amplitudes please a harmonics or overtones

Question 32

Ultrasounds

Answer 32

Sound of the frequency between 20,000 to 100,000 Hz used for forming images of internal body parts

Question 33

Echoes

Answer 33

The reflection of sound against a barrier

Question 34

Sonar

Answer 34

Sound navigation and ranging used to locate object underwater the speed of sound in water is roughly 1500 m/s

Question 35

Radar

Answer 35

Radio and ranging used to locate object in the air this is used as an light travels faster at 3×10 to the 8 m/s in comparison to sound which travels at 330 m/s in air

Question 36

Doppler effects

Answer 36

When a sound of a source is moving towards you the pitch sound higher than that of the source when a source moves away from you the pitch sounds lower this is known as the Doppler affect the wavefront is stretched out behind the source i.e. the pitch is lower because the frequency is Lower and Wave fronts are compressed ahead of the source pitch is higher because the frequency is higher