Arc spectra: analysis of line and band spectra G.M. counter Curie temperature Millikan's oil drop method: electron charge Velocity of ultrasonic waves in liquids (a) by diffraction (b) by inteferometer. Twyman-Green interferometer. Fourier transform processor. Hall effect. Scintillation counter. X-ray powder photograph Magnetostriction Thermal expansion: Fizeau's method Latent heat of liquid nitrogen. Absorption spectrum of colour centers spectrophotomerter.
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