A body of mass 4 kg is raised from height 2 m to 8 m. Increase in potential energy (g=10) is MCQ with Answer and Explanation

Explanation:
ω = 2π × (rpm/60) = 2π × 120/60 = 4π rad/s.

Explanation:
Wave speed v = frequency (f) × wavelength (λ). Thus v = 50 Hz × 2 m = 100 m/s. This fundamental wave equation applies to all periodic waves (sound, light, water). Memory aid: 'v = fλ – the universal wave equation'. Competitive exams frequently test this direct calculation. Always ensure units: Hz = s⁻¹, so (s⁻¹)×m = m/s, correct for speed. This problem assesses basic wave property understanding, crucial for sound and light topics.

Explanation:
Sound waves are mechanical, require medium.