Explain the index of refraction of air?
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What are rectifiers used for?
how many neutrons and how many protons are present in a single deuterium nucleus?
is the below statement correct. the force of attraction of earth on a man, who is inside the artificial satellite is zero
Tell me what is radium used for?
Why land breeze is caused ?
Explain the cause of brownian motion?
What is frequncy?
What is the Magnetic substance ?
Why gave we to put back the clock continually, when we travel round the world west-wards ?
Why is it easier to swim in sea water than in the river water?
Which waves are used in sonography?
Why are the mountains colder than the plains ?