The scientist who invented the electric generator is MCQ with Answer and Explanation

Explanation:
T ∝ √L, so √4 = 2 times.

Explanation:
Doppler effect: apparent change in frequency due to relative motion. Siren pitch changes as it approaches/recedes. Echo is reflection. Bending is diffraction. Fusion is nuclear reaction.

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.