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NEET
Exam
NEET
Subject
Physics
Chapter
Semiconductors

NEET · Physics · Semiconductors

Assertion (A) Si and GaAs are the preferred materials for solar...

Assertion (A) Si and GaAs are the preferred materials for solar cells. Reason (R) Both these materials have energy band gaps much below the energy level corresponding to the maximum solar irradiance ln the solar spectrum. The correct answer is

Options

  1. A(A)(A) is correct but (R)(R) is incorrect.
  2. BBoth (A) and (R) are correct and (R) is the correct explanation of (A).
  3. CBoth (A)(A) and (R)(R) are correct but (R)(R) is not the correct explanation of (A).
  4. DBoth (A) and (R) are incorrect.

Correct answer

A. (A)(A) is correct but (R)(R) is incorrect.

Step-by-step solution

Key Idea The energy band gap of Si is 1.14eV1.14 \mathrm{eV} and GaAs is 1.42eV1.42 \mathrm{eV}. Both Si and GaAs are used to make solar cells. In visible spectrum, energy is vary from about 3eV3 \mathrm{eV} on the violet side to 1.5eV1.5 \mathrm{eV} on red side, so visible light can make solar energy. But radiowaves, microwaves and Infrared waves has less photon energy than the band gap of Si and GaAs. Hence, the assertion is correct but reason is wrong. Therefore, the correct option is (a).
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