Sound moves at 345m/sec towards a rock wall, reflects and returns as an echo. The roundtrip takes 2 sec.

How far away

2 thoughts on “Sound moves at 345m/sec towards a rock wall, reflects and returns as an echo. The roundtrip takes 2 sec. <br /><br />How far away”

1. Explanation:

   So Distance travelled by the sound

   = ( 345 × 2 ) metre

   = 690 metre

   Now in 2 sec sound has travelled twice the distance between the wall and the source

   Hence the distance between the wall and the source

   \displaystyle\sf{ = \frac{690}{2} \: \: metre }=

   2

   690

   metre

   \displaystyle\sf{ = 345 \: \: metre }=345metre

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2. SOLUTION

   GIVEN

   • Sound moves at 345m/sec towards a rock wall, reflects and returns as an echo.

   • The roundtrip takes 2 sec.

   TO DETERMINE

   How far away is the wall

   EVALUATION

   Here it is given that

   Sound moves at 345 m/sec towards a rock wall

   ∴ Speed of sound = 345 m/sec

   Now the sound reflects and returns as an echo.

   The roundtrip takes 2 sec.

   So Distance travelled by the sound

   = ( 345 × 2 ) metre

   = 690 metre

   Now in 2 sec sound has travelled twice the distance between the wall and the source

   Hence the distance between the wall and the source

   [tex]\displaystyle\sf{ = \frac{690}{2} \: \: metre }[/tex]

   [tex]\displaystyle\sf{ = 345 \: \: metre }[/tex]

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