CBSE Class 12 Physics 2017 Outside Delhi Set 2 Paper

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Question : 7
Total: 9
(a) In the following diagram, which bulb out of B1 and B2 will glow and why?

(b) Draw a diagram of an illuminated p-n junction solar cell.
(c) Explain briefly the three processes due to which generation of emf takes place in a solar cell.
Solution:  
(a) Identification of the bulb and reason
(b) Diagram of solar cell
(c) Names of the processes
(a) Bulb B1 glows
Diode D1 is forward biased.

(b) Diagram

(c) Generation: Incident light generates electron-hole pairs.
Separation: Electric field of the depletion layer separates the electrons and holes.
Collection: Electrons and holes are collected at the n and p side contacts.
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