Oscillation, Motion of body to and forth and back to forth, population inversion, Number of active atoms in higher energy state, Electron, Particles which revolves around the nucleus, interfernce, superposition of two or more waves, ultrasonic , waves having freqeuncy above audible range, monochromatic, light having single wavelength, unit cell, smmallest and repating arrngment in crstal structre, X Rays, Electromagnetic wave having short wavelength.

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