Q32 of 269 Page 141

Solar cells are made of:

Because in semiconductors, the energy band gap is quite less. The photons can easily eject the electrons out of it provided the energy of the electrons is more than the threshold energy required.

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At a hydro power plant:

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The part of box-type solar cooker which is responsible for producing greenhouse effect is:

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The value of solar constant is

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The radiations present in sunlight which make a solar cooker work are