Question

The number of cycles which a sounding body makes in each unit of time is known as:

• A. Pitch
• B. Reverberation
• C. Frequency
• D. Sound intensity

Hint:

Important sound terms:
• Frequency $\rightarrow$ Number of vibrations per second
• Pitch $\rightarrow$ Perception of frequency
• Intensity $\rightarrow$ Loudness of sound
• Reverberation $\rightarrow$ Persistence of reflected sound

Answer 1

The Correct Option is C

Concept: Sound is produced due to vibrations of a body. The number of vibrations or cycles completed by a sounding body in one second is called its frequency. Frequency determines the pitch of sound and is measured in: \[ \text{Hertz (Hz)} \]

Step 1: Understand the meaning of frequency.
If a vibrating body completes: \[ n \] cycles in one second, then: \[ \text{Frequency} = n \; \text{Hz} \] Thus, frequency refers to the number of cycles occurring per unit time.

Step 2: Analyze the given options.
• Pitch -- Refers to the sensation of highness or lowness of sound.
• Reverberation -- Persistence of sound after the source stops due to repeated reflections.
• Frequency -- Number of cycles or vibrations per unit time. \checkmark
• Sound intensity -- Amount of sound energy passing through unit area. Therefore, the correct answer is: \[ {\text{Frequency}} \]