Two travelling waves of the "same frequency", "same amplitude", and travelling in "opposite direction" result in?
Correct answer: B. Standing waves
- A. Beats
- B. Standing waves
- C. Diffraction
- D. None of these options are correct
Explanation
OPTION A: The periodic motion in the loudness of sound which is heard when two notes of nearly the same frequency are played simultaneously, is called beats.OPTION B: When two plane waves having the same amplitude and frequency, traveling with the same speed in opposite directions along a line, are superposed, a wave obtained is called a stationary or standing wave. Hence, B is the correct option.OPTION C: The spreading of light waves around the edges of a narrow opening is called diffraction.OPTION D: It is an incorrect option.
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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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