anonymous
  • anonymous
If 20 waves of water pass you in 5.0 s and the waves are 2.0 m long, how fast are they moving? 1.0 m/s , 2.0 m/s , 4.0 m/s , or 5.0 m/s ?
Physics
schrodinger
  • schrodinger
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Michele_Laino
  • Michele_Laino
is 2.0 meters the wave length ?
anonymous
  • anonymous
i think so :)
anonymous
  • anonymous
ohh so our solution is 2.0 m/s?

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Michele_Laino
  • Michele_Laino
I'm pondering...
anonymous
  • anonymous
ok!
Michele_Laino
  • Michele_Laino
if 20 waves pass in 5 seconds, the one wave pass in 5/20=0.25 seconds
Michele_Laino
  • Michele_Laino
so I see one wave length every 0.25 seconds, and the requested speed is: 2/0.25=8
Michele_Laino
  • Michele_Laino
what is wrong in my reasoning?
anonymous
  • anonymous
ohh okay! ermm i am not sure... :/ the solution is 8 though right? :/
anonymous
  • anonymous
i am not sure why that is not a choice? :/
anonymous
  • anonymous
because your reasoning makes sense :/
Michele_Laino
  • Michele_Laino
yes!
anonymous
  • anonymous
okay! thank you!! :)
Michele_Laino
  • Michele_Laino
I'm sorry!
anonymous
  • anonymous
haha it is okay! thank you:)
Michele_Laino
  • Michele_Laino
please try to ask to another tutor
anonymous
  • anonymous
okie:)
anonymous
  • anonymous
thankyou!!
Michele_Laino
  • Michele_Laino
please wait I call for another tutor
anonymous
  • anonymous
okie! :)
Michele_Laino
  • Michele_Laino
@Australopithecus please help!
Michele_Laino
  • Michele_Laino
@Hero please help
Michele_Laino
  • Michele_Laino
@amistre64 please help
Michele_Laino
  • Michele_Laino
@sammixboo please help
Michele_Laino
  • Michele_Laino
@Jaynator495 please help
Michele_Laino
  • Michele_Laino
@Nnesha @ParthKohli please help
ParthKohli
  • ParthKohli
\[v = f \times \lambda\]
ParthKohli
  • ParthKohli
v - velocity of the wave. f - frequency of the wave (number of waves passing in 1 second). \(\lambda\) - wavelength, or length of a wave.
anonymous
  • anonymous
so f=20/5 = 4 waves per second? and wavelength is 2.0 m ?
ParthKohli
  • ParthKohli
That is correct. The answer is thus \(4 ~s^{-1} \times 2 ~m = 8 ~ms^{-1}\).
anonymous
  • anonymous
ooh okay! hmm i am not sure then :/ i was not given that choice :( i think maybe a typo? haha :P but yes, thank you both very much!!:)
Michele_Laino
  • Michele_Laino
thanks! @ParthKohli

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