Maharashtra BoardEnglish MediumSTD 12 SciencePhysicsMechanical Properties of Fluids4 Marks
Question
Define (1) range of molecular attraction or molecular range (2) sphere of influence.
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Answer
1) Range of molecular attraction or molecular range : Range of molecular aftraction or molecular range is defined as the maximum distance between two molecules up to which the intermolecular force of attraction is appreciable. [Note: The intermolecular force is a short range force, LeV, it is effective over a very short range-about $10^{-9} \mathrm{~m}$. Beyond this distance, the force is negligible. The inter molecular force does not obey inverse square law.] 2) Sphere of influence: The sphere of influence of a molecule is defined as an imaginary sphere with the molecule as the centre and radius equal to the range of molecular attraction. [Note : All molecules lying within the sphere of influence of a molecule are attracted by (as well as attract) the molecule at the centre. For molecules which lie outside this sphere, the intermolecular force due to the molecule at the centre is negligible.]
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