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All India 2019
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Q4 of 47 Page 1

What is the speed of light in a denser medium of polarising angle 30°?

Polarizing angle of incidence,


If the polarising angle of incidence is and the refractive index is , then they are related by:




Also, we know that



where is the speed of light and is the speed of light in the medium.




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2

How does the mobility of electrons in a conductor change, if the potential difference applied across the conductor is doubled, keeping the length and temperature of the conductor constant ?

3

Define the term “threshold frequency”, in the context of photoelectric emission.

OR


Define the term “Intensity” in photon picture of electromagnetic radiation.


5

In sky wave mode of propagation, why is the frequency range of transmitting signals restricted to less than 30 MHz?

OR


On what factors does the range of coverage in ground wave propagation depend ?


6

Two bulbs are rated (P1, V) and (P2, V). If they are connected (i) in series and (ii) in parallel across a supply V, find the power dissipated in the two combinations in terms of P1 and P2.

Questions · 47
All India 2019
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