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What is Atomic Models?The concept of atoms was first suggested by the ancient Greeks. The atom was supposed to be the smallest piece of matter. Then J. J. Thompson discovered the electron, and the atom was found to be made of several smaller pieces. Ernest Rutherford conducted an experiment in which he shot alpha particles at thin gold foil. Based on his observations, he constructed a model of an atom that was mostly empty space. Practically all of the atom's mass is concentrated in a very small central nucleus, which is positively charged because of its protons; the nucleus is surrounded by an equal number of negatively charged electrons that are relatively far away. In 1913, Niels Bohr postulated that the hydrogen atom had one proton with one electron, which could only occupy definite allowed orbits. The most stable orbit is the one closest to the nucleus, and the atom is in the ground state when the electron occupies this most stable orbit. Only certain amounts of energy can be absorbed and used in order to have the electron jump to a higher energy orbit. When the electron returns to the lowest orbit, the atom can only give off a photon of energy equal to the change in energy of the electron. Only orbits where mvr = nh/2Π for the electron are possible. The principal quantum number, n, can be 1, 2, 3, 4, etc. The diagram shows the energy levels of hydrogen.
Energy: The term energy may be defined as the capacity for doing work. There are two forms of energy: potential energy and kinetic energy. POTENTIAL ENERGY Potential e
anyone guide me about the explanation of coulombs law
when dispersion is happening from a prism, the colors are separated out. do each of these colors move with different velocities to keep frequency constant? practically is it possib
Volume resistance: The resistance provided to the current which flows through the material is called volume resistance. For a cube of unit dimensions this is called volume resisti
INTERFERENCE and DIFFRACTION: INTERFERENCE: The physical effect of super position of waves from two sources vibrating with same frequency and amplitude is called the interfere
The fringe width in a Young's double slit arrangement is 0.008cm. What could be the fringe width if the slit separation is halved and the screen slit distance is doubled?
Q. Explain Rayleigh's criterion of just resolution of two spectral lines of equal intensities giving suitable intensity distribution carves. Show how the resolving power of a pla
Balanced and Unbalanced Forces:- Newton's first law of motion states that "an object at rest stays at rest and an object in motion stays in motion with the similar speed and in
How does a color changes works in glass, glass segments or a polymer material? This consists usually of a small, geared motor with a disc. It can be made of glass, a polymer ma
I need some examples (at least 5 examples) of daily life application of vector. could you please help me? thankyou
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