Q. Radio waves sent out by a radio stations are reflected by
This is a layer of atmosphere about 60 to 70 km above the earth and extends to about 400km. It contains ionised particles which can reflect radio waves making radio communication round the world possible.
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Q. The nucleus of an atom contains
Q. Who among the following is credited for the Corpuscular theory of light?
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Q. Which of the following produces more severe burns ?
Q. The magnifying power of an astronomical telescope can be decreased by
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