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Physics > P 12 Waves > Flashcards

P 12 Waves Flashcards

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1
Q

what is the frequency (Hz)

A

n. of waves passing a fixed point in 1 second.

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2
Q

what is the time period

A

time taken for 1 wave to pass

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3
Q

equation for frequency

A

time period

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4
Q

wavelenght

A

lenght of wave

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5
Q

longitudinal waves

A

energy travelling in same direction(parallel) as particles are oscillating

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6
Q

examples of longitudinal waves

A

sound, ultrasound waves

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7
Q

what are the transverse waves

A

energy travells perpendicularly to oscillions of particles

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8
Q

examples of trensaverse waves

A

radio microwaves, any electromagnetic waves

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9
Q

formula for speed

A

frequency x wavelenght

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10
Q

what is a crest and trough

A

maximum upwards/downwards displacement in a transverse wave

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11
Q

what are compressions and rarefactions

A

areas of maximum displacement in longitudinal waves.
the stronger the wave the more compressed and spread out the wave becomes

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12
Q

what is the amplitude

A

measurement of maximum displacement

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13
Q

frequency limits for human hearing

A

20-20 000 Hz

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14
Q

approximate speed of sound in air

A

340 m/s

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15
Q

what is echolocation

A

the use of sound waves and echoes to determine where objects are in space.

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16
Q

what do earthquakes do

A

create waves that pass through layers of the Earth and along its surface

17
Q

P waves

A

longitudinal “primary” waves

18
Q

S waves

A

transverse “secondary waves”

19
Q

what seismic wave cn travel through liquid

A

only P waves can

20
Q

what is refraction

A

bending of waves as they move into densier objects

21
Q

refraction effects (water waves)

A

wavelenght decreases
waves slow down
frequency staysthe same

22
Q

angle of reflection equals

A

agle of incidence

23
Q

what happen to speed and wavelenght during reflection

A

don’t change

Physics (10 decks)

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