Waves

Question 1

Wavelength

Answer 1

Distance between peaks

Question 2

Period

Answer 2

Time it takes for one wavelength to occurs.

= 1/f

Question 3

Amplitude

Answer 3

Height of a wave

Question 4

Intensity

Answer 4

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.

Question 5

Intensity in Decibels

Answer 5

10*log(I/I_o)

Question 6

Wave Velocity

Answer 6

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

Question 7

Constructive interference

Answer 7

Amplitudes add to one another, increasing amplitude.

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

Question 8

Destructive interference

Answer 8

Amplitudes are subtracted from each other, decreasing amplitude.

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

Question 9

Beats

Answer 9

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

f_{b =} |f₁ - f₂|

Question 10

Doppler Effect

Answer 10

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

Question 11

Frequency

Answer 11

Inversely proportional to wavelength

= 1/t

f = c / wavelength

c: 3.0 x 10⁸ m/s

measured in Hz

Question 12

Wavelength in open-open tubes

Answer 12

= 2L/n

n= any integer

Question 13

Wavelength in open-closed tubes

Answer 13

= 4L/n

n = any ODD integer