In a nuclear reactor, the function of a moderator is to MCQ with Answer and Explanation

Explanation:
Different colours have different speeds/refractive indices in glass, causing dispersion.

Explanation:
Slope = dv/dt = acceleration. Area under v-t gives displacement. Often confused.

Explanation:
A geostationary satellite orbits the Earth directly over the equator at an altitude of ~35,786 km. It revolves in the same direction the Earth rotates. Its orbital period perfectly matches Earth's rotational period, which is 24 hours. Because of this, it appears entirely stationary from any point on Earth's surface, making it ideal for communications and DTH TV.