Laplace found that the alternate compressions and rarefactions produced in sound waves follows ________________?
Correct answer: B. adiabatic law
- A. isothermal law
- B. adiabatic law
- C. isochoric law
- D. all of the above
Explanation
Sound compressions and rarefactions occur so rapidly that there is essentially no time for heat to flow between the gas and its surroundings. The pressure-volume changes are therefore adiabatic, following the adiabatic law rather than the isothermal law. Isothermal is the likely distractor because it is another gas law, but it would require constant temperature through heat exchange.
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Progressive waves transfer energy through a medium or space while particles oscillate about their equilibrium positions. The work includes amplitude, wavelength, frequency, period, phase difference, wave speed and the progressive wave equation, while distinguishing travelling waves from stationary waves, where the pattern has fixed nodes and antinodes.
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