Write down the concept of ear trumpet and Mega phone.

Explanation

Ear trumpet
(i) Ear trumpet is a hearing aid, which is useful by people who have difficulty in hearing.
(ii) In this device, one end is wide and the other end is narrow. The sound from the sources fall into the wide end and are reflected by its walls into the narrow part of the device. This helps in concentrating the sound and the sound enters the ear drum with more in tensity. This enables a person to hear the sound better.
Mage phone
(i) A megaphone is a hom-shaped device used to address a small gathering of people.
(ii) Its one end is wide and the other end is narrow. When a person spcaks at the narrow end, he sound of his speech is concentrated by the multiple reflections from the walls of the tube. Thus, his voice can be heard loudly over a long distance.