Question
What is a megaphone? Name the principle on which a megaphone works.
What is a megaphone? Name the principle on which a megaphone works.
A megaphone is a large, cone-shaped (or funnel-shaped) device for amplifying and directing the voice of a person who speaks into it. A megaphone works on the principle of multiple reflections of sound.
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What is paedogenesis?
| | A | B |
| Protons | 18 | 20 |
| Neutrons | 22 | 20 |
During ______, the lysosomes digest stored food contents by ______ to supply energy to the cell.
Mention two uses of multiple reflections of sound.