The phenomenon of diffraction is most pronounced when: MCQ with Answer and Explanation

Explanation:
Sound travels fastest in solids. Iron ~5000 m/s.

Explanation:
Damping opposes the motion of an oscillator (like a pendulum in thick oil). In 'underdamped' systems, it oscillates with decaying amplitude. In 'critically damped' systems, it returns to equilibrium as fast as possible without oscillating. In 'overdamped' or heavily damped systems, the resistive force is so strong that it slowly creeps back to equilibrium without ever crossing it to oscillate.

Explanation:
In uniform circular motion, speed is constant but velocity direction changes continuously, producing centripetal acceleration. Magnitude a = v²/r, direction always towards the center of the circle. This acceleration changes velocity direction without altering speed. Tangential acceleration would change speed, but here speed is constant. Formula derivation: From vector analysis of velocity change over small time interval. Exam tip: Remember 'centripetal' means 'center-seeking'; this concept is fundamental for rotational dynamics questions in competitive exams.