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why can you not hear the echo if you stand 10m away from the wall and shout towards it

because for a sound to get reflected back to (forming echo) there should at least be a minimum of 17.2 m distance between the source of sound and the obstacle. HOWTOPROVETHIS:-

Speed of light=344 m/s (approx.) t

time taken for brain to store sound=0.1seconds

therefore, distance=speed x time

d=344 x 0.1= 34.4

this is the distance of the source to the obstacle and then back also. so it is the double of the distance.

what we do next is 34.4/2 = 17.2m- minimum distance for hearing and echo

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because for a sound to get reflected back to (forming echo) there should at least be a minimum of 17.2 m distance between the source of sound and the obstacle. HOWTOPROVETHIS:-

Speed of light=344 m/s (approx.) t

time taken for brain to store sound=0.1seconds

therefore, distance=speed x time

d=344 x 0.1= 34.4

this is the distance of the source to the obstacle and then back also. so it is the double of the distance.

what we do next is 34.4/2 = 17.2m- minimum distance for hearing and echo

  • 3

because for a sound to get reflected back to (forming echo) there should at least be a minimum of 17.2 m distance between the source of sound and the obstacle. HOWTOPROVETHIS:-

Speed of light=344 m/s (approx.) t

time taken for brain to store sound=0.1seconds

therefore, distance=speed x time

d=344 x 0.1= 34.4

this is the distance of the source to the obstacle and then back also. so it is the double of the distance.

what we do next is 34.4/2 = 17.2m- minimum distance for hearing and echo

  • 5

because for a sound to get reflected back to (forming echo) there should at least be a minimum of 17.2 m distance between the source of sound and the obstacle. HOWTOPROVETHIS:-

Speed of light=344 m/s (approx.) t

time taken for brain to store sound=0.1seconds

therefore, distance=speed x time

d=344 x 0.1= 34.4

this is the distance of the source to the obstacle and then back also. so it is the double of the distance.

what we do next is 34.4/2 = 17.2m- minimum distance for hearing and echo

  • -1
because for a sound to get reflected back to (forming echo) there should at least be a minimum of 17.2 m distance between the source of sound and the obstacle. HOW TO PROVE THIS:-

Speed of light=344 m/s (approx.) t

time taken for brain to store sound=0.1seconds

therefore, distance=speed x time

d=344 x 0.1= 34.4

this is the distance of the source to the obstacle and then back also. so it is the double of the distance.

what we do next is 34.4/2 = 17.2m- minimum distance for hearing and echo
  • 12
To hear the echo we need to stand at least 17m away from the object this is because distance travel by sound is 1/10 seconds =34m thus we cannot hear the echo if you stand 10m away from the wall and shout towards it
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