ICP Chapter 15

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Waves/Sound

25 Terms

1

wave

a rhythmic disturbance that carries energy (NOT matter)

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2

medium

the matter that the wave travels through

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3

mechanical waves

must have a medium (ex: sound)

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4

electromagnetic waves

do not need a medium (ex: light)

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5

transverse wave

the particles of the medium vibrate perpendicular to the direction of the wave (ex: light, “the wave” in a stadium)

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6

longitudinal wave

particles of the medium vibrate parallel to the direction of the wave (ex: sound, slinky)

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7

wavelength

distance from a point on a wave to the same point on the next wave (abbreviated by lambda)

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8

amplitude

distance from rest position to crest OR trough

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9

what is amplitude determined by?

the amount of energy in the wave

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10

frequency (f)

number of waves to pass a given point

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11

frequency units

waves/second = Hertz(Hz)

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12

period (T)

the time for 1 wave to pass a given point

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13

period units

seconds/wave

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14

wave equation

lambda*frequency

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15

reflection

bouncing off of a wave at a barrier

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16

normal

imaginary line perpendicular to the barrier at the point of reflection

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17

angle of incidence (i)

angle from the incident wave to the normal

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18

angle of reflection (r)

angle from the reflected ray to the normal

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19

law of reflection

i = r

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20

refraction

the bending of a wave as it passes from one medium to another

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21

what happens when a wave changes mediums?

it changes speed

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22

diffraction

bending of a wave around the edge of a barrier

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23

interference

ability of 2 or more waves to add together to form 1 new wave

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24

constuctive

makes new wave with a larger amplitude “in phase”

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25

destructive

cancellation “out of phase”

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