Question

The conversion of light energy into electrical energy is achieved in a:

• A. Coolidge tube
• B. Thermocouple
• C. Photo cell
• D. Cloud chamber

Hint:

Photo cells, or photovoltaic cells, convert light energy into electrical energy by utilizing the photoelectric effect.

Answer 1

The Correct Option is C

Step 1: Understanding the photoelectric effect and photo cells.
A photo cell, also known as a photovoltaic cell, works on the principle of the photoelectric effect. When light strikes a metal surface in the cell, the energy of the photons causes the emission of electrons. These emitted electrons create an electric current, effectively converting light energy into electrical energy. This process is the basis of solar panels, which use the photoelectric effect to generate electricity from sunlight.
Step 2: The working principle of other devices.
- A Coolidge tube is used to generate X-rays, and it doesn't directly convert light energy to electrical energy.
- A thermocouple generates an electrical current due to temperature differences, not light.
- A cloud chamber is used to detect the paths of charged particles, and it does not convert light energy into electrical energy.
Step 3: Conclusion.
Thus, the correct device that converts light energy into electrical energy is a photo cell, corresponding to option (C).