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For beats to be produced,

Correct answer: C. Frequency of sources should be different and amplitude should be different

  • A. Frequency of sources should be different and amplitude should be the same
  • B. Frequency of sources should be same and amplitude should be different
  • C. Frequency of sources should be different and amplitude should be different
  • D. Frequency of sources should be same and amplitude should be the same

Explanation

Beats arise from interference of two waves of nearly equal but different frequencies; comparable amplitudes maximize audible beat amplitude modulation. Option A captures the necessary condition.

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About Waves

Progressive waves transfer energy through oscillations, with wavelength, frequency, amplitude and wave speed related by v = fλ; sound speed depends on the medium. Superposition produces interference and stationary waves in strings and organ pipes, while simple harmonic motion describes the oscillation itself and must be distinguished from wave propagation.

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