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प्रश्न
A bat moving at 10 ms−1 towards a wall sends a sound signal of 8000 Hz towards it. On reflection, it hears a sound of frequency f The value of f in Hz is close to (speed of sound = 320 ms−1)
पर्याय
8516
8258
8424
8000
MCQ
उत्तर
8516
Explanation:
Sound frequency reflected by the bat
= `[("V" - (-"V"_0))/("V" - "V"_"s")] f = [("V" + "V"_0)/("V" - "V"_"s")] f = ("V" + 10)/("V" - 10) f`
= `((320 + 10)/(320 - 10)) xx 8000`
= 856 Hz
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