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Physics Ox > Waves > Flashcards

Waves Flashcards

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1
Q

Do waves transfer matter?

A

no, just energy

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2
Q

compressed region longitude wave

A

compression

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3
Q

streched region longitudes wave

A

rarefaction

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4
Q

crest

A

highest point of wave

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5
Q

trough

A

lowest point of wave

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6
Q

amplitude

A

maximum distance a particle can be displaced from rest region

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7
Q

which wave can travel through a vacuum

A

electromagnetic wave

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8
Q

do longitudinal waves travel faster through solids or gases?

A

solids: use particles of matter oscillating to transfer energy

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9
Q

how fast are em in vacuum

A

speed of light

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10
Q

how can the speed of an em change

A

change in medium

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11
Q

em spectrum

A

radio waves, microwaves, IR, visible light, UV, X-rays, gamma
! continuous

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12
Q

ionising radiation

A

EM waves with high enough energy to remove electron from atom –> create ion

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13
Q

law of reflection

A

angle of incidence = angle of reflection

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14
Q

Einfallsstrahl

A

incident ray

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15
Q

Why is light falling into a prism divided into different wavelengths

A

red refracted least (lowest speed) etc.

red resists, blue bends

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16
Q

how is sound refracted when coming into denser medium?

A

away from normal (speeds up)

17
Q

refraction

A

change of direction of a wave due to the change in speed when entering a different medium

18
Q

doppler effect

A

relative motion between source and observer

19
Q

sound waves

A

pattern of vibrations caused by vibrating source

20
Q

how is sound detected?

A

pattern of rarefaction and compression causes change in pressure

21
Q

speed of sound waves

A

dependent on medium

22
Q

range of human hearing

A

20Hz –> 20kHz

23
Q

medical scanning with ultrasound

A

determine boundaries & depth of the boundaries

Physics Ox (7 decks)

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