The Frequency Determines the Shrillness or Pitch of a Sound - True

Frequency refers to the number of cycles or vibrations that occur in a sound wave in a given amount of time. It is measured in Hertz (Hz), which represents the number of cycles per second. The frequency of a sound wave directly affects its pitch or shrillness.

Frequency and Pitch
- Pitch refers to how high or low a sound is perceived to be. It is determined by the frequency of the sound wave.
- Higher frequencies are associated with higher pitches, while lower frequencies are associated with lower pitches.
- For example, a high-pitched sound, like that of a flute or a bird chirping, has a higher frequency compared to a low-pitched sound, like that of a bass guitar or a car engine.

Relation between Frequency and Pitch
- The relationship between frequency and pitch is directly proportional. As the frequency of a sound wave increases, the pitch also increases.
- This means that if the frequency of a sound wave doubles, the pitch will also double. Similarly, if the frequency is halved, the pitch will be halved as well.
- For example, if a sound wave has a frequency of 1000 Hz, it will have a higher pitch compared to a sound wave with a frequency of 500 Hz.

Shrillness and Frequency
- Shrillness refers to the perception of a sound wave as being sharp, piercing, or high-pitched.
- The higher the frequency of a sound wave, the more shrill it is perceived to be.
- This means that as the frequency of a sound wave increases, the shrillness also increases. Conversely, as the frequency decreases, the sound becomes less shrill.

Examples
- In musical instruments, the pitch of a note is determined by the frequency at which it vibrates. Higher frequency vibrations produce higher-pitched notes, while lower frequency vibrations produce lower-pitched notes.
- In human speech, the pitch of a person's voice is determined by the frequency of their vocal cords vibrating. Higher frequency vibrations result in a higher-pitched voice, while lower frequency vibrations result in a lower-pitched voice.

Conclusion
The relationship between frequency and pitch is directly proportional, meaning that as the frequency increases, the pitch also increases. Similarly, as the frequency decreases, the pitch decreases. The frequency of a sound wave also determines its shrillness, with higher frequencies being perceived as more shrill or high-pitched. Therefore, the statement "The frequency determines the shrillness or pitch of a sound" is true.