Megaphone Experiment: It is still a mystery that who between Samuel Morland and Athanasius Kircher invented megaphone first. A megaphone amplifies the sound by increasing the acoustic impedance. Megaphones also direct the sound waves to a specific direction that the announcer wished to send them. Let us try making a megaphone in a simple format.
Try it yourself
- A large sheet of paper
- A tape
- A friend
Step 1: Roll the paper sheet into a cone. Make sure that the ends of cone are open – one narrow opening and the other wide.
Step 2: Stick tape along the edge of paper to stick it tight to the shape. Your megaphone is ready.
Step 3: Talk without using your megaphone and note the loudness of your talks.
Step 4: Now talk through the megaphone and ask your friend to compare the sounds.
Megaphone Experiment Logic: Your friend will experience that the talks through megaphone louder. This is because the megaphone amplified the sound by increasing the acoustic impedance. Learn about acoustic impedance here.
If you liked this experiment, try our simple stethoscope experiment here.