Pitch and Frequency of Sound Reading Comprehension Lesson

What Is Pitch?

When you hear a sound, you notice many things about it. Some sounds are loud and some are soft. Some sounds are high-pitched, while others are very deep and low. The pitch of a sound is a measure of how high or low the sound is.

The pitch of a sound depends on the length and thickness of the object that is vibrating. It also depends on how fast the object is vibrating. The easiest way to observe this is by comparing the pitch of different strings on a guitar. Thicker strings have lower pitches, while thinner strings have higher pitches.

The sound of an individual string can be made even higher by shortening its length. A guitar player does this by pressing a part of the string against the neck of the guitar. Guitar strings can also be tightened or loosened to change their pitch.

The Human Voice and Sound Waves

The pitch of a person’s voice depends on the length and thickness of the vocal cords. In general, men have longer and thicker vocal cords than women, so men’s voices are usually deeper. You can vary the pitch of your own voice by tightening or relaxing your vocal cords.

Even though we cannot see sound waves, scientists can measure how quickly they vibrate using a machine called an oscilloscope. This machine measures how many times per second an object vibrates, which is known as frequency. Frequency is measured in units called hertz (Hz). One hertz equals one vibration per second.

Objects that vibrate very quickly produce sounds with a high frequency and a high pitch. Objects that vibrate slowly produce sounds with a low frequency and a low pitch. Understanding pitch and frequency helps scientists, musicians, and engineers design everything from concert halls to hearing aids.

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