Physics Questions

To hear a distinct echo the time interval between the original sound and the reflected sound must be at least

_________ is a natural electrical phenomenon characterized by the appearance of streamers of reddish or greenish light in the sky, especially near the northern or southern magnetic pole.

Optical fiber works on the principle of -

Heavy water is mostly used in which of the following?

____________________is a measure of the actual amount of water vapour in a particular sample of air: measured as a partial pressure.

Light travels fastest in

In the equation of motion 2as = v2 - u2, s represents _________________.

An Odometer is an instrument used to measure ____ in automobiles.