$\frac{1}{(LC)^{1/2}}$ where L and C are inductance and acapacitance
$(LC)^2$
the impedance L alone
the dielectric and skin effiect
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The Correct Option isD
Solution and Explanation
Basically, a coaxial cable consists of a hollow (outer) cylindrical conductor surrounding a single (inner) conductor along its axis. The two conductors are well insulated from each
other. The electric field $(\vec{ E })$ and magnetic
field $(\vec{ H })$ at the cross-sections are shown by solid lines and dotted lines, respectively. The outer conductor acts as the shield and minimises interference.
Different kinds of dielectric materials, such as teflon and polythene are covered over
copper wire, it acts as a pacer. In the transmission of power through coaxial cable, the dielectric medium separating the inner conductor from outer one plays a vital
role. These dielectric materials are good insulators only at low frequencies. As the frequency increases, the energy loss becomes significant. That is why a coaxial cable can be used effectively for transmission upto a frequency of $20\, MHz$. A steady signal flowing in a wire, uniformly distributes itself throughout the cross-section of the wire. A high frequency signal, on the other hand distributes itself uniformly, there being a concentration of current on the outer surface of the conductor. If the frequency of the current is very high, the current is almost wholly confined to the surface layers. This is called 'Skin effect'.
Radiation is the energy or particles from a source that travels from one media to other. It travels through a medium after its emission from a source and is absorbed by matter.
Forms of Radiation:
Particle Radiation includes the alpha (α), beta (β), and neutron radiations.
Gravitational Radiation includes the radiation that takes the form of gravitational waves or as ripples in the curvature of space-time.
Acoustic Radiation includes ultrasound, seismic and sound waves.
Electromagnetic Radiation is inclusive of radio waves, gamma radiation (γ), x-rays, and visible light.
Types of Radiation:
Ionizing Radiation - It carries more than 10 eV, that is enough to ionize atoms and molecules and break chemical bonds.
Non-ionizing Radiation – It consists of alpha particles, beta particles, and gamma particles, whereas ionizing radiation consists of microwave radiation, infrared radiation and radio waves.
