How is sound produced?
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Describe the Periscope?
in one optical instrument, what is the effect of usingtwo converging lenses?
whether egg or hen came first
Explain how many more times louder is 70 decibels than 10 decibels?
Explain about Electron microscope?
Why does a tea kettle sing?
What is fluorescence?
What is the cause of brownian motion?
how does a medicine is filled in dropper
why we need complex no. in physical world?
If f equals electric force, and q and q (read as: q-prime) are the charges on two particles, the expression f is proportional to q times q prime divided by distancesquared is what law?
Tell me when taken to the top of a mountain, a clock will go fast or go slow or no change or stop?