What is the index of refraction of air?
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Explain when is fluorescence strong?
How does the electricity travel ?
Tell me why does a tilted gyroscope not fall?
Is there god and what is the difference between energy in space and so called goddly energy
Explain what is the measure of the force of gravity on an object?
When we go higher up, for how much distance does the temperature roughly decrease by 1oF
Which of the surfaces of a thermos flask are silvered and why?
At what temperature does the filament of electric bulb glows ?
Who did first record the sound?
Why dies a boat-man push the bank with an oar, when he wants to clear his boat off the bank?
How much does automotive oil weigh?
Is air travel time the same whether or not the plane is flying with or against the rotation of the earth?