Physics
Grade-7
Easy
Question
The vibrating diaphragm of a drum emits energy in the form of _____.
- Kinetic energy
- Sound energy
- Chemical energy
- Nuclear energy
Hint:
Sound energy
The correct answer is: Sound energy
A diaphragm exhibits vibratory motion to produce sound. As the diaphragm moves forward, it compresses the air in front of it, hence, density of air increases at that place. This part of air causes next layer of air to compress and the wave travels in the air with certain speed creating compressions. The compressed air presses on the bottom head and changes its shape. Then these changes are transmitted to the drum shell and reflected back, and this action is repeated, creating a vibration thus, sound is produced.
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