The human ear can hear sound in frequency range MCQ with Answer and Explanation

Explanation:
According to Gauss's Law in electrostatics, all excess charge on a conducting body resides entirely on its outer surface. Since there is no net charge enclosed within the hollow interior, the electric flux and consequently the electric field everywhere inside the hollow conducting sphere is exactly zero.

Explanation:
η = 1 - 300/600 = 1 - 0.5 = 0.5 = 50%. Maximum possible efficiency for given temperatures. Memory aid: 'η_Carnot = 1 - T_cold/T_hot; always < 100%'. Thermodynamics calculation frequently tested in competitive exams.

Explanation:
Efficiency η = useful work output / total work input = useful power output / total power input, since power = work/time. Both definitions are equivalent for steady operation. Efficiency is always < 1 (or