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NEET 1993 (AIPMT) · Reflection, Superposition & Interference

Reflection, Superposition & Interference question from NEET 1993 (AIPMT)

Q22NEET 1993 · AIPMTEasy

Reflection, Superposition & Interference

Wave has simple harmonic motion whose period is 4 seconds while another wave which also possesses simple harmonic motion has its period 3 second. If both are combined, then the resultant wave will have the period equal to

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Answer: (c)

The combined motion repeats only when both waves complete whole numbers of cycles together.
Resultant period $=$ LCM of $4\text{ s}$ and $3\text{ s}$ $= 12\text{ s}$ .
So the answer is (c) $12\text{ s}$ .

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