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santos911 santos911
  • 28-04-2016
  • Physics
Answered

A Cannon makes a noise, and it's echo is heard 4.5 seconds later. if sound travels at 343 m/s:


a.) how far did the sound travel?


b.) how far away is the surface it reflected off of?

Verified Answer :

AL2006
AL2006 AL2006
  • 28-04-2016


a).  (343 m/s) x (4.5 sec)  =  1,543.5 meters

b).  The surface it reflected from is  (1543.5 / 2) = 771.75 meters away.

     The sound had to go there AND come back before you heard the echo.

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