Question

which best describes pitch?
the amount of time taken for a longitudinal wave to produce one cycle
the number of cycles per second perceived by the human ear
the amplitude of a wave when the natural frequency is matched
the distance between two corresponding parts of a transverse wave

Explanation:

Pitch is related to frequency. Frequency is the number of cycles per second. When sound waves (which are longitudinal waves) reach the human ear, the perception of how high or low the sound is (pitch) is based on the frequency (number of cycles per second) of those sound waves.

• The amount of time taken for a longitudinal wave to produce one cycle is the period (not pitch).
• The amplitude of a wave when the natural frequency is matched is related to resonance (not pitch).
• The distance between two corresponding parts of a transverse wave is the wavelength (not pitch).

Answer:

the number of cycles per second perceived by the human ear