What are the three bigness parameters?

• A. Wavelength, Frequency, Phase
• B. Amplitude, Frequency, Wavelength
• C. Power, Intensity, Pressure
• D. Amplitude, Power, Intensity

Answer: (D)

How strong a wave is can be captured by three key measures: amplitude, power, and intensity. Amplitude describes how large the oscillation or field strength is in the wave. Power tells us how much energy the wave transports per unit time. Intensity is the power carried per unit area, giving a sense of how concentrated that energy is as the wave travels through space. Together, these describe the magnitude and energetic impact of the wave: bigger amplitude usually means more power, and, for a given area, higher intensity.

The other options mix quantities that describe timing or scale (like wavelength or frequency) or give a related but not primary measure (like pressure). Those don’t capture the primary sense of “bigness” or strength that amplitude, power, and intensity convey.