Concept:The microphone converts sound into an electrical signal, while the speaker converts an electrical signal into sound.
Explanation:Statement 1 is incorrect. The microphone does not convert sound to a mechanical signal.
It uses a transducer to convert sound waves into an electrical signal.
Statement 2 is correct. The microphone's main function is to convert sound waves into an electrical signal.
This electrical signal is then processed and transmitted.
Statement 3 is incorrect. The speaker does not convert a mechanical signal to sound.
Instead, it converts an electrical signal into sound waves.
An electrical signal passes through the voice coil, interacts with a magnet, and vibrates the cone to produce sound.
Statement 4 is correct. The speaker converts an electrical signal into sound.
It receives the electrical signal from the audio source and generates sound waves via the voice coil and magnet.[br]
Answer:The correct statements are 2 and 4. Therefore, the correct option is D: 2 and 4.