RRB Technician Grade 3 previous year question
An echo is heard in 6 s. If the distance of the reflecting surface from the source is 990 m, then how much is the speed of sound?
Asked in RRB Technician Grade 3 (09 Mar 2026 Shift 2) · Science
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Correct answer: (C) 330 m/s
Speed of sound = 2×distance/time (since sound travels to the reflector and back) = 2×990/6 = 330 m/s.
हिंदी में प्रश्न
प्रतिध्वनि 6 सेकंड में सुनाई देती है। यदि स्रोत से परावर्तक पृष्ठ की दूरी 990 m है, तो ध्वनि की चाल कितनी होगी?
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (C) 330 m/s
ध्वनि की चाल = 2×दूरी/समय (क्योंकि ध्वनि परावर्तक तक जाकर वापस आती है) = 2×990/6 = 330 m/s।
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