Waves Flashcards Preview

MCAT Math/Phys > Waves > Flashcards

Flashcards in Waves Deck (13):
1

Wavelength

Distance between peaks

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2

Period

Time it takes for one wavelength to occurs. 

= 1/f

3

Amplitude

Height of a wave

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4

Intensity

Units: W/m2

I is proportional to amplitude square and frequency is squared

= P / 4πr2

Attenuation: idea that as we go out, the waves will interfere with each other and encounter resistance. 

5

Intensity in Decibels

10*log(I/Io)

6

Wave Velocity

V = wavelength x frequency

  1. Wave speed is determined by the medium
  2. Frequency doens't change from medium to medium
  3. Wavelength does change when a wave moves from medium to medium

7

Constructive interference

Amplitudes add to one another, increasing amplitude. 

Will occur when two waves are out of phase by 360°

8

Destructive interference

Amplitudes are subtracted from each other, decreasing amplitude.

Will occur when two waves are out of phase by 180°

9

Beats

Also known as beat frequency

Occurs when two tones with different frequencies are playing at one time. 

i.e. wobble sound heard when tuning instruments

fb = |f- f2|

10

Doppler Effect

Relative change in frequency and pitch due to position of observer. 

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11

Frequency

Inversely proportional to wavelength

= 1/t

f = c / wavelength

c: 3.0 x 108 m/s

measured in Hz

12

Wavelength in open-open tubes

= 2L/n 

n= any integer

13

Wavelength in open-closed tubes

= 4L/n 

n = any ODD integer