The wave of theory of light is based on

The unit of magnetic permeability is

When the displacement of a simple harmonic oscillator is zero, its speed is

A metal-semiconductor junction diode is called ___

In uniform circular motion, the linear velocity perpendicular to

Positive feedback is used in

Energy per unit volume is dimensionally equal to

Thermocouple consists of

A ball pen function on the principle of

The three famous law of Kepler is related to