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I do not understand how to approach this question.

I do not understand how to approach this question. oqiern.PNG


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  • why do you do 20/4 ?
    • SargentJellyfish3050
    • May 10, 2018 at 6:25am
  • The distance from P to R is 20 cm, and the wavelength of the water waves are 4 cm. So 20 cm * 1 wavelength/4cm = 5 wavelengths
    • onteria
    • May 10, 2018 at 7:27am

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