Correct Answer - Option 2 : Q
Simple harmonic motion:
- It is a special type of periodic motion, in which a particle moves to and fro repeatedly about a mean position.
- In linear S.H.M. a restoring force which is always directed towards the mean position and whose magnitude at any instant is directly proportional to the displacement of the particle from the mean position at that instant
Restoring force ∝ Displacement of the particle from mean position.
F = -kx
Where k is known as force constant. It's S.I. unit is Newton/meter
The general expression for the wave is given by:
y = A Sin (ωt + θ)
y = 0 is the mean position of particle
Where A = amplitude of wave, ω = angular frequency, t is time and θ = phase angle,
Amplitude: It is the maximum displacement of the object from the equilibrium position.
Motion of particle is given by
y = P + Q sin ωt
⇒ y - P = Q sin ωt
So, particles execute SHM with mean position y = P.
Let y -P = y'
⇒ y' = Q sin ωt
Comparing this equation by equation of SHM,
We will get amplitude
A = Q
Hence, particles execute simple harmonic motion with amplitude Q.