A wave has speed 300 m/s and frequency 150 Hz. Wavelength is MCQ with Answer and Explanation

Explanation:
Position-time graph as parabola: x = x₀ + ut + ½at². This quadratic form indicates constant acceleration 'a'. If acceleration were changing, the graph would be cubic or higher order. Constant velocity would produce a straight line (linear graph). Upward opening parabola implies positive acceleration. Graph interpretation skill is essential: slope of x-t graph = velocity; curvature indicates acceleration. Memory tip: Parabolic x-t graph ⇔ constant acceleration; linear x-t graph ⇔ constant velocity. Competitive exams frequently test graph-concept correlations.

Explanation:
Potential energy is the stored energy an object possesses due to its position relative to other objects, stresses within itself, its electric charge, or other factors. For example, water stored in a dam has gravitational potential energy, and a compressed spring has elastic potential energy.

Explanation:
After 3 half-lives, remaining = (1/2)³ = 1/8, so disintegrated = 1 - 1/8 = 7/8. Fraction disintegrated = 7/8. Option A remaining. So B.