RRB Technician Grade 3 previous year question
A sound wave has a frequency of 2 kHz and a wavelength of 45 cm. How much time will it take to cover a distance of 1.8 km?
Asked in RRB Technician Grade 3 (10 Mar 2026 Shift 2) · Science
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Correct answer: (A) 2 seconds
Speed of sound = frequency × wavelength = 2000 Hz × 0.45 m = 900 m/s. Time to cover 1.8 km = 1800 m is 1800/900 = 2 seconds.
हिंदी में प्रश्न
एक ध्वनि तरंग की आवृत्ति 2 kHz और तरंगदैर्ध्य 45 cm है। 1.8 km की दूरी तय करने में इसे कितना समय लगेगा?
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (A) 2 सेकंड
ध्वनि की गति = आवृत्ति × तरंगदैर्ध्य = 2000 हर्ट्ज़ × 0.45 मीटर = 900 मी/से है। 1.8 किमी = 1800 मीटर तय करने में समय = 1800/900 = 2 सेकंड लगेगा।
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