When two tuning forks of nearly the same frequencies are sounded together, a note of alternately increasing and decreasing intensity will be heard. This note is called
Correct answer: A. Beat.
- A. Beat.
- B. Waveform.
- C. Diffraction.
- D. Polarisation.
Explanation
The correct answer is beat. When two tuning forks with nearly the same frequencies are sounded together, they produce interference patterns that lead to variations in the intensity of the sound heard, known as beats. This occurs because the sound waves periodically reinforce and cancel each other. The other options do not describe this phenomenon: a waveform is the shape of the wave, diffraction involves the bending of waves, and polarisation pertains to the orientation of wave oscillations, which are unrelated to the described sound intensity changes.
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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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