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Quantum mechanics is a fundamental theory in physics which describes nature at the smallest scales of energy levels of atoms and subatomic particles. Quantum mechanics differs from classical physics in that energy, momentum, angular momentum and other quantities of a bound system are restricted to discrete values (quantization)


is it possible that at the same time if both position and momentum were measured, then we got the pure states of both the function?

A black body need not be of black color. Black body means a body which ABSORBS all wavelengths completely. A black body doesn't reflect any light. A mirror can't be a black body because when you shine a light beam on a mirror, it doesn't absorb it completely, because it reflects some wavelengths. A black body can't be a transparent object. Because when you shine a beam of light on a transparent object, it doesn't absorb it, instead it allows some wavelengths to go through it. For a black-body to look white, it will have to emit wavelengths corresponding to the visible region with nearly equal intensities because white light is composed of visible colors but with EQUAL intensities of all the colors. If your black paint absorbs all wavelengths completely then only it is a black-body.

go through this video to have close look into quantum non-locality. https://www.youtube.com/watch?v=5RMeZdq-zcw but you should first know what is principle of locality. In physics, the principle of locality states that an object is directly influenced only by its immediate surroundings. A theory which includes the principle of locality is said to be a "local theory". This is an alternative to the older concept of instantaneous "action at a distance". Locality evolved out of the field theories of classical physics. The concept is that for an action at one point to have an influence at another point, something in the space between those points such as a field must mediate the action. To exert an influence, something, such as a wave or particle, must travel through the space between the two points, carrying the influence.

Is it necessary that a black body must be black in colour???

What is quantum nonlocality?

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