8If the two sound waves produce beats, it is necessary that the two have:
Correct answer: B. Slightly different frequencies
- A. The same frequencies
- B. Slightly different frequencies
- C. Slightly different amplitudes
- D. The same time periods
Explanation
Beats occur when two sound waves of similar amplitudes and slightly different frequencies interfere with each other. This interference causes alternating constructive and destructive interference, resulting in the variations in loudness perceived as beats. Option B is correct because the slight difference in frequencies is essential for the creation of this interference pattern. Option A is incorrect because identical frequencies do not result in interference patterns. Option C is incorrect because differences in amplitude do not affect the beat frequency; they only affect the intensity of the sound. Option D is incorrect because the same time periods imply the same frequencies, which do not result in beats.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Optics
Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
Practise Optics
665 free Optics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 11 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.