Sound: Pitch and Loudness
Class 8 Science: sound
Change how fast the sound source vibrates and how big the vibrations are. See the wave change and hear the sound.
Words to know
- Vibration
- A quick to-and-fro movement that makes sound.
- Pitch
- How high or low a sound is.
- Frequency
- Vibrations per second, measured in hertz (Hz).
- Amplitude
- How big the vibration is; bigger is louder.
Quick check
Answer 3 questions to check what you learned.
Try at home
Stretch a rubber band over an open box and pluck it. Stretch it tighter and pluck again: the pitch goes up because it vibrates faster.