Physics Waves UHS 2022
PMDC Verified Question 56 of 125
Which of the following increases by increasing amplitude?
A
Wavelength
B
Zero
C
Frequency
D
Loudness
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Loudness
Concept:

Amplitude represents the maximum displacement of a wave from equilibrium, directly dictating how much energy the wave carries.

Solution:

  • In the context of sound waves, the amplitude specifically governs the intensity of the sound.


  • Loudness is the subjective human perception of sound intensity. It is directly proportional to the square of the amplitude (\( I \propto A^2 \)).


  • Therefore, increasing the amplitude strictly increases the perceived loudness.


Why other options are incorrect:

Wavelength and frequency dictate the wave's pitch and propagation geometry; they remain completely unchanged when only the amplitude is altered.

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