What function does a megaphone serve during an emergency?

A megaphone serves the essential function of amplifying sound, which is critical during emergencies when clear communication is necessary. It allows emergency responders or leaders to issue instructions and information to a large group of people over significant distances, ensuring that messages reach everyone, even in noisy or chaotic environments. This amplification is vital to directing individuals towards safety, providing updates on the situation, or instructing them on necessary actions to take.

In contrast, while extinguishing fires or facilitating emergency exits are important, they are not functions associated with a megaphone. Similarly, alerting passengers about turbulence pertains to aviation safety and communication methods specific to that context, rather than an emergency response tool. Thus, the primary role of a megaphone in an emergency context is indeed to communicate instructions effectively.