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Glossary Of Physics Terms
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Magnetic domain:Small regions in permanent magnets within which atomic or molecular magnetic moments are aligned parallel.
Magnetic field:The region around a magnet where its magnetic force is experienced by other magnetic objects.
Magnetic reversal:The changing of polarity of the earth's magnetic field as the north magnetic pole and the south magnetic pole exchange positions.
Magnetic wave:The spread of magnetization from a small portion of a substance where an abrupt change in the magnetic field has taken place.
Magnification:The ratio of the size of the image to the size of the object.
Malus law:The intensity of the light transmitted from the analyzer varies directly as the square of the cosine of the angle between the plane of transmission of analyzer and polarizer.
Maser:Microwave amplification by stimulated emission of radiation.
Mass defect:The difference between the sum of the masses of the individual nucleons forming a nucleus and the actual mass of that nucleus.
Mass number:The sum of the number of protons and neutrons in a nucleus.
Mean life:The average time during which a system, such as an atom, nucleus, exists in a specified form.
Mechanical energy:The sum of energy possessed by a body due to its position, configuration and motion.
Mechanical wave:The waves, which need a material medium for their propagation, e.g., Sound waves.
MeV:Unit of energy, equal to 1.6 x 10-13 joules.
Megahertz:Unit of frequency, equal to 106 hertz.
Millibar:A measure of atmospheric pressure equivalent to 1000 dynes per cm 2.
Modulus of elasticity:The ratio of stress to the strain produced in a body.
Modulus of rigidity:The ratio of tangential stress to the shear strain produced in a body.
Mole:The amount of a substance that contains Avogadro's number of atoms, ions, molecules, or any other chemical unit; a mole is 6.02 x 1023 atoms, ions, or other chemical units.
Momentum:The product of mass and velocity of a body, it is a measure of the quantity of motion in a body.
Monochromatic light:Consisting of single wavelength.

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