Physics
Ashish, Sameer, Aditya and Mohit were sitting on the terrace of Ashish’s house listening to the songs playing on Aditya’s mobile phone Mohit, sitting in one corner, a little distance away from the others, requests to increase the volume of the songs. But Aditya says the volume is full. Sameer, being a smart guy, gets up, goes into the kitchen, brings an empty steel glass, places the mobile phone inside it and solves the problem. What is the reason for Sameer to keep the mobile phone in the glass?
Sound
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Answer
Placing the phone in a steel glass amplifies the sound due to a few reasons:
- Resonance Effect: The air column inside the glass has same natural frequency for certain frequencies produced by phone speaker, due to resonance its loudness increases.
- When we put our phone in a glass, the sound from the speaker makes the glass vibrate. The glass has more surface area than the phone speaker alone, so it vibrates more air. More moving air means stronger sound waves, and that makes the sound feel louder to our ears.
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