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Physics > 100% M: Waves sound and light > Flashcards

100% M: Waves sound and light Flashcards

1
Q

what is a pulse

A

a single disturbance in a medium

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2
Q

what is a medium

A

any substance through which the pulse moves

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3
Q

what is a transverse wave

A

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

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4
Q

what is propagation

A

wave movement

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5
Q

what is the amplitude

A

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

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6
Q

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

A

the two pulses interfere with each other

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7
Q

name the two types of meeting points

A

constructive Interference
destructive interference

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8
Q

what is constructive interference

A

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

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9
Q

what is the destructive interference

A

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

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10
Q

what is the principle of superposition?

A

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

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11
Q

draw an example of constructive/destructive interference

A
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12
Q

what is a wave

A

a regular succession of pulses

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13
Q

what are the two types of waves

A

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

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14
Q

what is an example of mechanical and electromagnetic waves

A

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

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15
Q

what is a crest

A

the highest point on a wave

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16
Q

what is a trough

A

the lowest point on a wave

17
Q

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

A

. same direction
. same wavelength
. same instant

18
Q

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

A
19
Q

what is wavelength

A

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

20
Q

what is period (T)

A

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

21
Q

what is frequency (f)

A

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

22
Q

what is wave speed

A

the distance traveled by a wave in one second

23
Q

what is longitudinal waves

A

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

24
Q

what is compressions

A

areas where the coils are close together

25
Q

what are rarefaction

A

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

26
Q

wave speed in longitudinal waves

A

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

27
Q

amplitude in longitudinal wave

A

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

28
Q

where do the particles travel faster

A

solid => liquid

29
Q

what is pitch and what is affected

A

refers to the high or low sound
frequency and wavelength

30
Q

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

A

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

30
Q

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

A

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

31
Q

what is noise

A

when wave patterns are irregular and has no clear repetitive

32
Q

what is ultrasound

A

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

33
Q

what is wave-particle duality

A

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

34
Q

what is quanta

A

the energy of electromagnetic radiation divided

35
Q

what is a photon

A

carries energy directly proportional to the frequency

36
Q

what is an example of electromagnetic wave

A

light

37
Q

what is VHF

A

Very High Frequency

38
Q

what is UHF

A

Ultra High Frequency

Physics (4 decks)

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