The phenomenon of beats is the result ofI. diffractionII. polarisationIII. interference
Correct answer: B. III only.
- A. I only.
- B. III only.
- C. I and II.
- D. II and III.
Explanation
The correct answer is III only. Beats occur due to the interference of two waves with slightly different frequencies. When these waves overlap, they produce a resultant wave that varies in amplitude over time, creating the characteristic 'beating' sound. Option I (diffraction) and Option II (polarisation) do not lead to the formation of beats. Diffraction is the bending of waves around obstacles, and polarisation involves the orientation of wave oscillations, neither of which result in the interference pattern characteristic of beats.
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About Superposition and Interference
Superposition states that overlapping waves produce a resultant displacement equal to the algebraic sum of their individual displacements. Interference covers constructive and destructive interference, phase difference, path difference, coherent sources, and conditions for maxima and minima. It differs from diffraction, which involves spreading around openings or obstacles.
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