CHAPTER ONE - NCERT
speed of light : 10–22 s to 1018s. The range of masses goes from, say, 10–30 kg (mass of an electron) to 1055 kg (mass of known observable universe). Terrestrial phenomena lie somewhere in the middle of this range. Fig. 1.1 Theory and experiment go hand in hand in physics and help each other’s progress. The alpha scattering
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