3.5
3.5 recall and use the relationship between the speed, frequency and wavelength of a wave:
wave speed = frequency × wavelength
v = f × λ
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| <<Waves - Tr Lo WL f A.mpg>> | <<Longitudinal wave, wavelength. v = f x lambda.mpg>> |
v = f λ
v = wave speed (m/s)
f = frequency (Hz) or (cycles/s)
λ = wavelength (m)
1,000 Hz = 1 kHz
1000,000 Hz = 1,000 kHz = 1 MHz
3.5 Plenary
10 February 2011
14:52
· What happens to the wavelength if you increase the frequency of the wave but keep the wave speed the same?
· What happens to the wavelength if you decrease the frequency of the wave but keep the wave speed the same?
· Verify your answers by using http://www.falstad.com/ripple/
Super tough extension task
· Try changing the speed in the simulation. Does that do what you expect? Explain.
Answers
v = f λ
Increases
v = f λ
Decreases
Super tough extension task
· Try changing the speed in the simulation. Does that do what you expect? Explain.
· The slider just changes the "simulation speed" NOT the "wave speed"!
virtual ripple tank
11 January 2011
15:12
