Verified Solution • 2025–26 Session moderate

QAIPMT-2010-Ph-2067: NEET 2010 Physics - Class 12 AIPMT-2010-Ph-2067 Solution: Assuming the sun to have a spherical outer surface of radius r…

Assuming the sun to have a spherical outer surface of radius r radiating like a black body at temperature

t^\circ C

the power received by a unit surface (normal to the incident rays) at a distance R from the centre of the sun is where

\sigma

is the Stefan's constant.

\frac{4\pi r^2 \sigma (t+273)^4}{R^2}

\frac{16\pi^2 r^2 \sigma t^4}{R^2}

\frac{r^2 \sigma (t+273)^4}{R^2}

\frac{4\pi r^2 \sigma t^4}{R^2}

A Pure Si doped with trivalent impurities gives a p-type semiconductor.
B Majority carries in a n-type semiconductor are holes.
C Minority carries in a p-type semiconductor are electrons.
D The resistance of intrinisic semiconductor decreases with increase of temperature.

Step-by-Step Verified Solution

In a n-type semiconductors, electrons are majority carriers and holes are minority carriers.