Speed of sound in air is 330 ms−1. A man standing at a distance of 165 m from a high wall, claps his hands. Will the man hear a distinct echo? Give a reason for your answer in (i).

Speed of sound in air is 330 ms−1. A man standing at a distance of 165 m from a high wall, claps his hands. (i) Will the man hear a distinct echo? (ii) Give a reason for your answer in (i).

Speed of sound in air is 330 ms⁻¹. A man standing at a distance of 165 m from a high wall, claps his hands.

कारण सांगा

(i) Yes, the man will hear a distinct echo.

(ii) The sound travels to the wall and back, so the total distance travelled is 2 × 165 = 330 m.

The time taken is t = distance ÷ speed = 330 ÷ 330 = 1 s.

Since this is greater than the persistence of hearing (0.1 s), the reflected sound is heard as a distinct echo.

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पाठ 6: Sound - EXERCISE-1 [पृष्ठ १२२]

पाठ 6 Sound
EXERCISE-1 | Q 2. (b) | पृष्ठ १२२