Which set lists the five parameters initially determined by the sound source only?

Which set lists the five parameters initially determined by the sound source only?

• A. Period, Frequency, Amplitude
• B. Period, Frequency, Amplitude, Power, and Intensity
• C. Frequency, Amplitude, Power, and Intensity
• D. Period, Frequency, and Intensity

Answer: (B)

The key idea is what the sound source establishes right at the moment of emission. The source fixes how long one cycle lasts (the period) and how many cycles occur each second (the frequency). It also sets how large the oscillations are (the amplitude), which relates to loudness. In addition, the source determines how much energy it emits per unit time (the power). From that energy, the initial energy flow per unit area leaving the source is characterized by the intensity. So all five—period, frequency, amplitude, power, and intensity—are determined by the source at emission. The other options miss one or more of these aspects (for example, omitting period, or omitting power and intensity), so they don’t capture everything the source sets initially.

The key idea is what the sound source establishes right at the moment of emission. The source fixes how long one cycle lasts (the period) and how many cycles occur each second (the frequency). It also sets how large the oscillations are (the amplitude), which relates to loudness. In addition, the source determines how much energy it emits per unit time (the power). From that energy, the initial energy flow per unit area leaving the source is characterized by the intensity. So all five—period, frequency, amplitude, power, and intensity—are determined by the source at emission. The other options miss one or more of these aspects (for example, omitting period, or omitting power and intensity), so they don’t capture everything the source sets initially.