Two resistors 3 Ω and 6 Ω are connected in parallel. The equivalent resistance is MCQ with Answer and Explanation
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Question #1
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A loud sound can be distinguished from a faint sound by its
Question #2
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Echo minimum distance for distinct hearing (speed sound = 340 m/s, persistence = 0.1 s):
Correct Answer: Option C
Explanation:
Time for to-and-fro: t = 2d/v ≥ 0.1 s ⇒ d ≥ vt/2 = 340×0.1/2 = 17 m. Minimum distance for brain to distinguish echo from original sound. Memory tip: 'd_min = v×persistence/2'. Application of sound reflection with human perception limit, common in competitive exam numericals.
Time for to-and-fro: t = 2d/v ≥ 0.1 s ⇒ d ≥ vt/2 = 340×0.1/2 = 17 m. Minimum distance for brain to distinguish echo from original sound. Memory tip: 'd_min = v×persistence/2'. Application of sound reflection with human perception limit, common in competitive exam numericals.
Question #3
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The process of emission of electrons from a metal surface by heating is
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