More energy = louder
The more energy you give an object, the bigger its vibrations, and the louder the sound. Hit a drum hard and it's loud; tap it gently and it's quiet.
Amplifiers
Megaphones, speakers and the body of a guitar all amplify (make bigger) the vibrations so we hear more sound.
Soundproofing
Soft materials like curtains, cushions and carpet absorb sound waves, making rooms quieter.
🔑 Key Terms
- Amplify
- To make a sound louder.
- Absorb
- To soak up sound waves so less sound bounces back.
Did you know?
Recording studios cover walls with foam shapes — they're not for decoration; they absorb sound so recordings sound clean!
Try it at home: Cup megaphone
- Cut the bottom off a paper cup.
- Hold the small end to your mouth and speak.
- Notice how much louder you sound!