100% M: Waves sound and light

Question 1

what is a pulse

Answer 1

a single disturbance in a medium

Question 2

what is a medium

Answer 2

any substance through which the pulse moves

Question 3

what is a transverse wave

Answer 3

a wave in which the medium vibrates at right angles to the direction of its propagation. Particles move up and down.

Question 4

what is propagation

Answer 4

wave movement

Question 5

what is the amplitude

Answer 5

Is the maximum disturbance of a particle from its rest (pulse)

Question 6

what does it mean if two pulses meet each other at the same time and place

Answer 6

the two pulses interfere with each other

Question 7

name the two types of meeting points

Answer 7

constructive Interference
destructive interference

Question 8

what is constructive interference

Answer 8

when the displacements are in the same direction = the resultant displacement will increase

Question 9

what is the destructive interference

Answer 9

when the displacements are in opposite direction = the resultant displacement will decrease

Question 10

what is the principle of superposition?

Answer 10

the magnitude(size) of the resultant displacement is the algebraic sum of the displacements of the pulses before the interference occurred

Question 11

draw an example of constructive/destructive interference

Question 12

what is a wave

Answer 12

a regular succession of pulses

Question 13

what are the two types of waves

Answer 13

mechanical ( needs a medium)
electromagnetic (does not need a medium)

Question 14

what is an example of mechanical and electromagnetic waves

Answer 14

mechanical —> sound/water waves
electromagnetic—> light/ radio waves

Question 15

what is a crest

Answer 15

the highest point on a wave

Question 16

what is a trough

Answer 16

the lowest point on a wave

Question 17

what does it mean if the points are (in phase)

Answer 17

. same direction
. same wavelength
. same instant

Question 18

what does it mean if the points are (out of phase)

Question 19

what is wavelength

Answer 19

the difference between two successive(one after the other) in phase points

Question 20

what is period (T)

Answer 20

of a wave is the time taken for a single wave to pass a given point

Question 21

what is frequency (f)

Answer 21

the number of full waves passing a given point in one second

Question 22

what is wave speed

Answer 22

the distance traveled by a wave in one second

Question 23

what is longitudinal waves

Answer 23

consists of a series of consecutive compressions and rarefactions which move parallel to the direction of propagation. Particles move right angles to the direction of the wave

Question 24

what is compressions

Answer 24

areas where the coils are close together

Question 25

what are rarefaction

Answer 25

areas the coils are spread further apart than they are when the spring is at rest.

Question 26

wave speed in longitudinal waves

Answer 26

the speed at which the compressions and rarefactions move through the medium parallel to the direction of propagation.

Question 27

amplitude in longitudinal wave

Answer 27

the maximum distance the particles of the medium move from the rest position.

Question 28

where do the particles travel faster

Answer 28

solid => liquid

Question 29

what is pitch and what is affected

Answer 29

refers to the high or low sound frequency and wavelength

Question 30

what is loudness, what is affected and what is sound measured in

Answer 30

loudness depends on the amplitude, amplitude, decibels (dB)

Question 30

what is loudness, what is affected and what is sound measured in

Answer 30

loudness depends on the amplitude, amplitude, decibels (dB)

Question 31

what is noise

Answer 31

when wave patterns are irregular and has no clear repetitive

Question 32

what is ultrasound

Answer 32

sounds with the frequency of greater than 20Hz and cannot be heard by the human ear

Question 33

what is wave-particle duality

Answer 33

when electromagnetic radiation can be explained by using a wave model or a particle model

Question 34

what is quanta

Answer 34

the energy of electromagnetic radiation divided

Question 35

what is a photon

Answer 35

carries energy directly proportional to the frequency

Question 36

what is an example of electromagnetic wave

Answer 36

light

Question 37

what is VHF

Answer 37

Very High Frequency

Question 38

what is UHF

Answer 38

Ultra High Frequency