Duduli

Answer:- A particle may be said to execute a simple harmonic motion if its acceleration is proportional to its displacement from its equilibrium position, or any other fixed point in its path, and is always directed towards it.

Answer:- If a oscillating tuning fork is placed vertical on a hollow box containing air having natural frequency equal to that of tuning fork,then the air inside the box is set into resonant vibrations of large amplitude and intense sound is heard.Such a box is called resonance box.

Answer:- A motion which repeat itself after a regular interval of time is called periodic motion. Osicallatory motion is a special case of periodic motion in which the particle move to & fro. And SHM is the special case of Oscillatory motion in which the particle move same displacement in either side of the mean position.