Explain what are wave fronts?
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I’ve heard that in quantum physics a lot of fancy mathematical objects like hilbert spaces are used, and that in particular, measurable quantities are described by self-adjoint operators. Are these things related to what you have just explained? : quantum physics
Why dies the earth move round the sun, and the moon round the earth ?
Difference between intrinsic and extrinsic semiconductors?
Explain what is the transparent?
Why does the moon shine, evening though it has not light of its own ?
What is the force needed to accelerate a mass of one kilogram one meter per second per second?
Explain the Vapour pressure ?
how much mercury overflows when a glass vessel filled to the brim with 50 cubic centimeter of mercury 15°C is heated to 75°C of glass?
When a bicycle is in motion, the force of friction exerted by the ground on the two wheels is such that it acts a) In the backward direction on the front wheel and in the forward direction on the rear wheel. (b) In the forward direction on the front wheel and in the backward direction on the rear wheel. (c) In the backward direction on both the front and rear wheels. (d) In the backward direction on both the front and rear wheels.
What is the proper definition of light?
What does hull speed mean?
How much does two pints of water weigh when frozen?