How does a Car horn produces sound?

Answer 1A car horn produces sound by using electrical energy to viabrate a diaphragm inside the horn which sets up pressure waves in the air, thus becoming sound when heard.

The horn diaphragm's creation of sound waves is similar to the way a speaker diaphragm converts electrical pulses from an amplifier into sound, except that the horn is designed to produce only a single frequency of sound, whereas the speaker can produce many different frequencies.