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⚛️ Physics  ·  Oscillations  ·  NEET & JEE

The SI unit of angular frequency ω is:

Answer: radian per second.

  • A radian per metre
  • B cycles per second
  • C metre per second
  • D radian per second

Correct answer: D. radian per second

Explanation: Angular frequency ω = 2πf is measured in radian per second. Cycles per second is the hertz (ordinary frequency), metre per second is speed, and radian per metre is the wave number.

Displacement, Velocity, Acceleration in SHMx(t)v(t)a(t)v leads x by 90°; a is exactly out of phase with x (a = −ω²x)

In SHM, displacement and velocity are 90° out of phase (v is maximum when x=0, and zero when x is extreme), while acceleration is always exactly opposite in sign to displacement, consistent with a = −ω²x.

Concept context

Simple harmonic motion, spring-mass, pendulum, energy in SHM, and resonance.

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