In a p-type semiconductor, the majority charge carriers and the minority charge carriers are respectively:
A. Ions and Holes
B. Electrons and Holes
C. Holes and Electrons
D. Protons and Electrons
Answer: Option C
Solution (By JKSSB Mock Tests)
A p-type semiconductor is created by doping a pure semiconductor (like Silicon) with a trivalent impurity (like Boron). This creates a deficiency of one electron, creating a 'hole'. These positive holes vastly outnumber the thermally generated free electrons. Thus, holes are the majority charge carriers, and electrons are the minority charge carriers.
Explanation:
PE = mgh, so directly proportional to height h. If h becomes 2h, PE becomes 2 × 100 = 200 J, assuming g constant. For large heights, g varies, but basic assumption. Thus 200 J.
Explanation:
Convex lens: object within focal length (u < f) produces virtual, erect, magnified image (magnifying glass). Beyond F: real images. Memory tip: 'Convex lens: u < f ⇒ virtual image; u > f ⇒ real image'. Ray optics concept frequently tested in competitive exams to verify lens image formation rules.
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