Why is this ratio so large ? 2.18 Explain this common observation clearly : If you look out of the window of a fast moving train, the nearby trees, houses etc. What is the ratio of molar volume to the atomic volume of a mole of hydrogen ? (Take the size of hydrogen molecule to be about 1 Å). What is the total atomic volume in m3 of a mole of hydrogen atoms ? 2.17 One mole of an ideal gas at standard temperature and pressure occupies 22.4 L (molar volume). The size of a hydrogen atom is about 0.5 Å. 2.16 The unit of length convenient on the atomic scale is known as an angstrom and is denoted by Å: 1 Å = 10–10 m. A boy recalls the relation almost correctly but forgets where to put the constant c. (This relation first arose as a consequence of special relativity due to Albert Einstein). 2.15 A famous relation in physics relates ‘moving mass’ m to the ‘rest mass’ mo of a particle in terms of its speed v and the speed of light, c. Rule out the wrong formulas on dimensional grounds. Cos 2πt / T ) (a = maximum displacement of the particle, v = speed of the particle.
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