How many beats can be observed when the difference in frequencies of two waves is two:
Correct answer: B. 2
- A. 1
- B. 2
- C. 3
- D. 4
Explanation
Beat frequency equals absolute difference of frequencies. If difference = 2 Hz, observer hears 2 beats per second.
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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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