# IB SL Physics Unit 4: Waves

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## Tags and Description

### 33 Terms

1

waves

a propagation of energy from one position to another

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2

mechanical

_________ waves: need a medium

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3

electromagnetic

_________ waves: don’t need a medium

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4

gamma xray ultraviolet visible infared micro radio

order the types of electromagnetic waves from high energy to low energy

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5

gamma xray ultraviolet visible infared micro radio

order the types of electromagnetic waves from high frequency to low frequency

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6

gamma xray ultraviolet visible infared micro radio

order the types of electromagnetic waves from low wavelength to high wavelength

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7

high low high

gamma has [high/low] energy, [high/low] wavelength, and [high/low] frequency

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8

low high low

radio has [high/low] energy, [high/low] wavelength, and [high/low] frequency

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9

transverse compressional

the two types of mechanical waves are _________ and __________

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10

period (T)

time it takes for the wave to repeat (seconds/wave)

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11

seconds/wave

period (T) is measured in

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12

Frequency (f)

waves per unit time (waves/second = Hertz (Hz))

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13

waves/second = Hertz (Hz)

Frequency (f)is measured in

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14

meters/second

Speed (v) is measured in

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15

Speed (v)

wavelength x frequency = wavelength/period

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16

c

speed of light in a vacuum (3.0×10^8 m/s)

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17

refraction

when light (or any wave) bends due to a change in media

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18

n

index of refraction

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19

Snell’s law

sinθ1/sinθ2 = n2/n1 = v1/v2

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20

critical angle

angle at which 0 refraction occurs

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21

diffraction

waves spread as they pass through an aperture or around objects

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22

s

in the s = wavelength x D/d equation, the fringe width

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23

d

in the s = wavelength x D/d equation, the slit distance

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24

D

in the s = wavelength x D/d equation, the distance from slit to screen

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25

standing

a ___________ wave has nodes and antinodes; two waves that are exactly the same travel in opposite directions

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26

travelling

a ___________ wave has a consistent amplitude and goes to infinity

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27

antiphase

exact opposite wave = π

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28

π

quantity of antiphase

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29

quantity of wave “in phase”

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30

3π/2

quantity of the antiphase of a travelling wave

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31

π/2

quantity of a travelling wave

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32

π

quantity of the antiphase of a standing wave

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33
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