Q5 of 47 Page 1

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 ?


In sky wave mode of propagation, electromagnetic waves reflect back from the ionosphere. Electromagnetic waves of frequencies higher than 30 MHz penetrate the ionosphere and escape.


OR


The maximum range of coverage depends on the transmitted power and frequency.


More from this chapter

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3

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

OR


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


 4

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

 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.

 7

Calculate the radius of curvature of an equi-concave lens of refractive index 1.5, when it is kept in a medium of refractive index 1.4, to have a power of –5D ?

OR


An equilateral glass prism has a refractive index 1.6 in air. Calculate the angle of minimum deviation of the prism, when kept in a medium of refractive index 4 √2/5.