How long will it take for the echo to return

  • Thread starter rrosa522
  • Start date
  • #1
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Homework Statement


A submarine sends out a sonar wave that has
a frequency of 545 Hz. If the wavelength of the
sound is 2.60 m, how long does it take for the
echo to return when the sound is reflected from
a submarine that is 5.50 km away?

Homework Equations




The Attempt at a Solution


i used the equation p=1/f and i plugged in frequency and got 0.00183 seconds, the right answer should be around 7-8 seconds
 

Answers and Replies

  • #2
SteamKing
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Homework Statement


A submarine sends out a sonar wave that has
a frequency of 545 Hz. If the wavelength of the
sound is 2.60 m, how long does it take for the
echo to return when the sound is reflected from
a submarine that is 5.50 km away?

Homework Equations




The Attempt at a Solution


i used the equation p=1/f and i plugged in frequency and got 0.00183 seconds, the right answer should be around 7-8 seconds

Well let's see here. Is it perhaps you calculated the period of one wavelength and overlooked the fact that it takes more than one wave of length 2.60 m to cover the distance of 5.50 km to the object and then 5.50 km back again to the sub?
 
  • #3
48
0
Well let's see here. Is it perhaps you calculated the period of one wavelength and overlooked the fact that it takes more than one wave of length 2.60 m to cover the distance of 5.50 km to the object and then 5.50 km back again to the sub?
thank you so much, i finally got the right answer!
 

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