The velocity of sound in air is 332 m/s. Velocity in the vacuum will be:
Correct answer: D. Zero
- A. Greater than 332 m/s
- B. Less than 332 m/s
- C. Equal to 332 m/s
- D. Zero
Explanation
Sound is a mechanical pressure wave requiring a material medium to propagate; a vacuum has no particles to transmit compressions/rarefactions, so sound speed in vacuum is zero.
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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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