During the day time, we can see things clearly. But we switch on the lights to see them at night. If we close our eyes we cannot see anything even during day time or at night with lights on. Why is that? So, let us find what requirements should be fulfilled to have “vision”. […]
You may have heard many sounds in the environment. Some of them are sounds of animals, human voices, noise of horns etc. But have you ever wondered how these sounds produce? So let’s study about that. How sounds produce? Sound is produced by vibrating something. The objects that produce sound are called sources of […]
