What does the period measure in a sound wave?

• A. Duration of one cycle
• B. Frequency of sound
• C. Amplitude of sound wave
• D. Speed of sound

Answer: (A)

The period in a sound wave specifically measures the duration of one complete cycle of oscillation. In sound waves, a cycle consists of one compression and one rarefaction. Understanding the concept of period is critical because it directly relates to how long it takes for the wave to repeat itself, which in turn affects how we perceive the sound's pitch.

The frequency of sound, which is the number of cycles per second, is inversely related to the period—meaning that as the period increases, the frequency decreases, and vice versa. Amplitude, on the other hand, refers to the height of the wave and is related to the loudness of the sound, not its duration. The speed of sound refers to how fast the wave travels through a medium, which is a separate characteristic. Thus, the correct understanding of the period is fundamental to grasping wave behavior in acoustics.