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B Physics problem (echoes) very easy!

  1. Jan 15, 2017 #1
    The Question:
    A boat is floating at rest in dense fog near a large cliff. The captain sounds a horn at water level and the sound travels through the salt water (1470 m/s) and the air (340 m/s) simultaneously. The echo in the water takes 0.40s to return. How much additional time will it take the echo in the air to return?

    My answer:
    d = v∆t

    d = 1470*0.40

    d = 588/2 (I checked online for this question, some ppl got different answers due to this part; 558/2 or just 588?)

    d = 294m

    294/340 = 0.86s

    0.86-0.40 = 0.46

    Additional time = 0.46s
  2. jcsd
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