Multiple choice general knowledge science & technology

A man stands at a certain distance from cliff. He wants to measure the distance from where he is standing to the base of the cliff. He rings an alarm and he gets to know the distance. How?

  1. because he is brilliant

  2. his eye have a distance measuring machine.

  3. the cliff told him the distance.

  4. he mesured the time ECHO of sound took to return from cliff and then measured the distance.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When sound travels to the cliff and reflects back as an echo, measuring the round-trip time allows distance calculation. Using the formula distance = (speed of sound × time) / 2, you can determine how far the cliff is.

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