Question

Name the physical quantity which determines the pitch of a sound.

• A. Wavelength
• B. Frequency
• C. Velocity
• D. Amplitude

Answer 1

The correct option is B Frequency

Frequency is the number of waves that pass through a point in one second, expressed in Hertz (Hz). Pitch is the highness or lowness of a sound. The pitch we hear depends on the frequency of the sound waves with the amplitude unchanged. The higher the frequency, the higher the pitch; the lower the frequency, the lower the pitch. A healthy human ear can hear sound frequencies from about 20 Hz to 20,000 Hz.
Hence, frequency is the physical quantity which determines the pitch of a sound.
Below is the diagram with represent wave disturbance and time for a sound changing from low pitch to high pitch, with the amplitude of the sound same.