Give any two applications of photoelectric cell

What is the principle used in photocell? State any two applications of photocell.

Define EMF series and explain any two applications of the electrochemical series.

State any four applications of photodiode?

Give any two applications of surface tensions.

Write two applications of capacitors in electrical circuits.

Explain any two applications of beats.

State any four applications of LED

Explain Einstein's theory of photoelectric effect and discuss any two characteristics of photoelectric effect using it

Give any four applications of thermal conductivity in everyday life.

Give any two examples of Bryophyta.