What is periodic wave?
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which of the following is connected with blood pressure?
Give an example of transverse wave?
what happens to the period of a simple pendulum taken into a deep mine
what does quantity of matter in an object denote
What is the commercial unit of electric power
Which particles/ rays do radioactive substances emit?
What is Concave lens ?
Explain the difference between a lens and a mirror?
Why in cold countries, the water at the surface freezes and in the inner portion it is in the sate of water ?
Explain what is optical medium?
What is black body ?
Why dies a man carrying a load on his back lean forward ?