An object is moving in a circular path with constant speed. Which of the following remains constant? MCQ with Answer and Explanation

Explanation:
Displacement has both magnitude and direction, vector. Distance is scalar (path length). Speed scalar. Energy scalar. Vector examples: velocity, force, acceleration.

Explanation:
When an object (like a jet plane) exceeds the speed of sound (Mach 1), it overtakes the sound waves it produces. These sound waves pile up behind the object, superimposing constructively to form an intense, cone-shaped pressure wave called a shock wave. When this high-pressure cone sweeps over an observer on the ground, they hear a loud 'sonic boom'.

Explanation:
f = E/h = 3.3 / 4.14×10⁻¹⁵ ≈ 8×10¹⁴ Hz.