11Q1)
Speed of light in vacuum is 1/√μoεo
Speed of light in medium is 1/√με
Hence by defenition of refractive index, it is √(με/μoεo)
Q1 If μo and εo represent permeablity and permittivity of vacuum and μ and ε be the permittivity and permeablity of medium,then calculate refractive index of medium.
Q2 In an npn transistor circuit,the collector current is 10mA.If 90% of the electrons are able to reach the collector,then calculate base current and emmiter current.
Q3 Mention the functions for which Zener diode is used.
Q4 A flake of glass(μ=1.5) is placed over one of the opening of double slit apparatus.The interference pattern displaces itself through 7 succesive maximas towards the side where flake is placed.If wavelength of diffracted light is λ=600 nm,then find thickness of flake.
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35 Answers
11Q2)
Ic=10mA
Ie=(100/90) x 10
=100/9 mA
Ie=Ib+Ic
Ib= Ie - Ic
= 10/9 mA
Hope it is correct [4]
P.S:
In real cases, Ib is in the order of μA. 10/9mA is actually too high a value of Ib.
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