Fill in the blanks with suitable word
Shrillness of a sound is determined by the________ of vibration.

Explanation

To fill in the blank in the statement "Shrillness of a sound is determined by the ________ of vibration," we can follow these steps:

1. **Understanding Shrillness**: First, we need to understand what is meant by "shrillness" in the context of sound. Shrillness refers to a high-pitched sound, which is often perceived as sharp or piercing.

2. **Identifying Key Terms**: The key term that relates to the quality of sound is "pitch." Pitch is a characteristic of sound that describes how high or low a sound is perceived.

3. **Relating Pitch to Vibration**: The pitch of a sound is directly related to the frequency of vibration. Frequency is defined as the number of vibrations or cycles per second, measured in Hertz (Hz). Higher frequency vibrations produce higher pitches, which we perceive as shrill sounds.

...