An electric doorbell uses electrical current thru a coil to move a metal bar using magnetism and cause it to strike a metal plate making a ring sound energy.

The answer is C because the energy in the form of electric is transmitted throughout which futhur get export in the form of sound energy..So both the phenomenon are occuring in quick interval of time..

Electric energy transformation in electric bells:

Electric bells are devices that use electric energy to produce sound. When an electric current flows through the coil of an electric bell, the electric energy is transformed into sound energy. Let's understand this process in detail:

1. Electric energy:
- Electric energy is the energy associated with the flow of electric charge.
- It is produced by a power source, such as a battery or a generator.
- In an electric bell, the electric energy is supplied by a power source connected to the bell circuit.

2. Electromagnetic effect:
- When an electric current flows through a wire, it generates a magnetic field around it.
- The coil in an electric bell is made up of a wire wound into a loop or multiple loops.
- When the electric current flows through this coil, it generates a magnetic field.

3. Magnetic energy:
- The magnetic field generated by the coil interacts with a permanent magnet or an electromagnet attached to a metal arm in the bell.
- This interaction causes the arm to move towards the coil or away from it, depending on the direction of the current.
- The movement of the arm is due to the magnetic energy transforming into mechanical energy.

4. Mechanical energy:
- The movement of the arm in the electric bell causes a clapper or a hammer to strike against a metal plate or a bell.
- This striking action produces vibrations in the metal plate or bell, creating sound waves.
- The mechanical energy from the movement of the arm is transformed into sound energy.

5. Sound energy:
- Sound energy is a form of kinetic energy associated with the movement of particles in a medium, such as air or water.
- In an electric bell, the vibrations produced by the striking action generate sound waves in the surrounding air.
- These sound waves travel through the air and can be heard as sound by our ears.

Therefore, in an electric bell, the electric energy is transformed into sound energy through a series of energy conversions involving electromagnetism and mechanical motion.