Physics
Grade-7
Easy
Question
Continuous vibrations at the source create:
- A pulse
- A wave
- Both pulse and a wave
- None of these
Hint:
A wave
The correct answer is: A wave
When an object vibrates, it generates kinetic energy, which is conveyed across the medium via molecules. When a vibrating sound wave collides with air particles, its kinetic energy is transferred to neighbouring molecules. As these energised molecules begin to move, they excite more molecules, and the process is repeated.
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