Physics
The device which converts sound energy into electrical energy is called

Microphone
Amplifier
Transmitter
Speaker

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Physics
Two identical solid pieces, one of gold and other of silver, when immersed completely in water exhibit equal weights. When weighed in air (given that density of gold is greater than that of silver)

The gold piece will weigh more
Both silver and gold pieces weigh equal
Weighing will depend on their masses
The silver piece will weigh more

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