Explanation
It is true that the radiowaves arc polarised electromagnetic waves. The antenna of portable AM radio is sensitive to only magnetic components of electromagnetic waves. On account of this the set should be put horizontal and in proper situation so that the signals are received properly from radio station.
Optical communication is a system by which we transfer the informations over any distance from one location to other through optical range of frequency using optical fibre. Thc optical interference between fibres is zero. Hence, optical fibre communication has immunity to cross talk.
Comparing with standard equation.
A study of binary star is most helpful in verifying Newton’s law of gravitation.
A group of bright and faint stars is called a constellation.
The sky is divided into 88 constellations.
Big Bang theory is the most satisfactory theory about the origin of universe.
Venus is the brightest planet.
A star which appears blue will be much hotter than the sun.
When distant stars are receding from us, spectral line from the star, when compared to with the corresponding line from source will show red shift i. e., a shift in frequency towards the red end.
Black hole is highly dense matter in the atmosphere which has very large value of gravitational pull, so that nothing escapes from it.
The age of universe is believed to be 10-20 billion years.
The energy of the sun is due to fusion of hydrogen nuclei into helium.
Venus appears brighter as it is nearest to the earth and the light of sun reflected form sun reaches earth with greater intensity.
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