Megaphones operate according to the ___________of sound.

• Megaphones or loudhailers, horns, and musical instruments such as trumpets and shehnais, are all designed to send sound in a particular direction without spreading it in all directions.
• In these devices, the sound is successively reflected by a tube and a conical opening, which directs most of the sound waves from the source forward toward the listener.

Therefore, we can say that a megaphone works on the principle of multiple reflections of sound.