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AIPMT 2010 Physics
Q. 23. The total radiant energy per unit area, normal to the direction of incidence, received at a distance R from the centre of a star of radius r, whose outer surface radiates as a black body at a temperature T K is given by:
(Where 
is Stefan’s constant)
Sol :
Answer : (1)
Q. 24. A common emitter amplifier has a voltage gain of 50, an input impedance of 100 Ω
and an output impedance of 200 Ω. The power gain of the amplifier is:
- 500
- 1000
- 1250
- 50
Sol: Power gain
Answer : (3)