Tamilnadu BoardEnglish MediumSTD 10ScienceAcoustics4 Marks
Question
Write down the concept of Ear trumpet and Megaphone.
✓
Answer
Ear trumpet:
Ear trumpet is a hearing aid, which is useful by people who have difficulty in hearing.
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 eardrum with more intensity. This enables a person to hear the sound better.
Megaphone:
A megaphone is a horn – shaped device used to address a small gathering of people.
It’s one end is wide and the other end is narrow. When a person speaks at the narrow end, the 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.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.