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Sound Waves
Physics · Kerala SSLC (Class 10) · English Medium · 36 questions and answers
Sample questions
- Q: What is sound?
- A: Sound is a form of energy produced by vibrating bodies that travels through a material medium as a wave and produces the sensation of hearing.
- Q: Why can sound not travel through vacuum?
- A: Sound needs a material medium (solid, liquid or gas) to travel because it propagates through vibrations of the particles of the medium. A vacuum has no particles, so sound cannot pass through it.
- Q: What kind of wave is a sound wave?
- A: Sound is a longitudinal wave, in which the particles of the medium vibrate back and forth along the same direction in which the wave travels.
- Q: What are compressions and rarefactions?
- A: Compressions are regions where the particles of the medium are crowded together (high pressure); rarefactions are regions where the particles are spread apart (low pressure). A sound wave travels as alternate compressions and rarefactions.
- Q: Define the frequency of a sound wave and give its unit.
- A: Frequency is the number of vibrations (or waves) produced in one second. Its SI unit is the hertz (Hz).
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