1. Energy
2. Sound travels as a mechanical wave through a medium (solid, liquid, or gas) by causing particles in the medium to vibrate and transfer energy from one particle to the next.
3. Longitudinal wave
4. Compressions and rarefactions
5. No, sound cannot pass through a vacuum because it requires a medium with particles to propagate; a vacuum has no particles to transmit vibrations.
6. Solids. Sound travels faster in solids because the particles are closer together, allowing vibrations to be transmitted more quickly than in liquids or gases.
7. An echo is the reflection of sound waves off a surface back to the listener, heard as a distinct repetition of the original sound after a delay.
8. We see lightning before hearing thunder because light travels much faster (approximately 300,000 km/s) than sound (approximately 343 m/s in air), so the visual signal reaches us almost instantly while the sound takes longer.
9. Loudness depends on the amplitude of the sound wave; pitch depends on the frequency of the sound wave.
10. Frequency of a sound wave is the number of complete cycles (vibrations) per second, measured in hertz (Hz).
11. Decibel (dB)
12. Hertz (Hz)
Parent Tip: Review the logic above to help your child master the concept of physics sound worksheet.
