Explain the construction of photoelectric cell and state its applications.

Explain the construction of a radio telescope.

What is photoelectric cell ? Give any two applications.

Explain the construction of Galileo's telescope.

Explain the construction and working of solar cell?

State Huygen's principle and hence explain the construction of spherical and plane wavefront.

Photoelectric cell is NOT used in

Explain the construction and working of photodiode

Draw a neat labelled diagram for the construction of photoelectric cell.Also draw a circuit diagram to describe the working of a photoelectric cell.

Explain the construction and working of Aled.