For what the parabolic dishes are used?
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How d o the radio-waves pass through walls ?
how sunlight produce e.m wave in vacuum?
When the seas freeze in-winter, the fish never die why?
Tell me how are amps and watts related?
Why does bluing make things whiter ?
What is acoustics?
When a green colored object is illuminated by a green light it will appear as what color to the human eye?
Examine the working of the Refrigerator?
Tell me why does a tilted gyroscope not fall?
What is the Electric motor ?
what is the name of the device that is made by combining two basic types of solid state rectifiers allowing the device to both rectify and amplify a current?
Why gave we to put back the clock continually, when we travel round the world west-wards ?