The force of attraction between any two bodies is directly proportional to the product of their masses and is inversely proportional to the square of the distance between them.
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brownian movement
the random motion of small particles suspended in a gas or liquid
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stationary states
The electron does not radiate electromagnetic energy in these special orbits, and because the energy is constant with time these are called stationary states.
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atomic nucleus
The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom.
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proton
a stable particle with positive charge equal to the negative charge of an electron
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alpha particle
a positively charged particle that is the nucleus of the helium atom; emitted from natural or radioactive isotopes
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cathode ray
a beam of electrons emitted by the cathode of an electrical discharge tube
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diffraction
when light passes sharp edges or goes through narrow slits the rays are deflected and produce fringes of light and dark bands
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spectral lines
distinct lines emitted by photoelectric effect
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quantization
the act of dividing into quanta or expressing in terms of quantum theory
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