Question

The useful energy change in the headphones is from ____________________ energy into ____________________ energy.
a- chemical energy to thermal energy
b- electrical energy to sound energy
c- from gravitational potential energy to sound energy
d- sound energy to thermal energy

Answer 1

Explanation:

A black hole is an area of space with a gravitational field so strong that nothing, not even light, can escape it. That's why black holes appear black. In some cases, black holes are former massive stars that have been crushed to an extreme density during supernova explosions.

Answer 2

Headphones : The batteries of the device (to which the headphone is plugged) use chemical potential energy to make electricity which is in turn converted into sound energy by the headphones.

Option (b). is correct.

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