Posterous theme by Cory Watilo

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

 

 

<<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

Image001

Increases

v = f λ

Image002

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

Link to animation

http://www.falstad.com/ripple/

 

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