What are beats ? Deduce the expression for beat frequency.

Derive an expression for resonant frequency.

Deduce the expression for energy density.

What is Doppler's effect? Derive an expression for the apparent frequencies when the medium at source is in motion, observe at rest.

What is banking of roads ? Deduce an expression for the angle practically in daily life.

What is S.H.M. ? Deduce an expression for the time period.