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Oscillations

76.The power ...

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76.The power of a sound from the speaker of a radio is 20 milliwatt. By turning the knob of the volume control the power of the sound is increased to 400 milliwatt. The power increase in decibel as compared to the original power is (a)13 dB (b)10 dB (c)20 dB (d)800 dB

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