A acoustic sensor records a sound wave. If the echo of the pulse reflects from an obstacle after 3 seconds, find the distance of the obstacle from the origin given the speed of sound is 340 m/s. MCQ with Answer and Explanation
A acoustic sensor records a sound wave. If the echo of the pulse reflects from an obstacle after 3 seconds, find the distance of the obstacle from the origin given the speed of sound is 340 m/s.
A. 960 meters
B. 1020 meters
C. 510 meters
D. 480 meters
Answer: Option C
Solution (By JKSSB Mock Tests)
Total path distance covered by the wave = 340 * 3 = 1020 meters. Distance to the obstacle = 1020 / 2 = 510 meters.
If a student walks from his house to school at 5 km/h, he is late by 10 minutes. However, if he walks at 6 km/h, he is late by only 2 minutes. Find the distance between his house and school.
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