নবম-দশম শ্রেণি

UNIVERSAL PHYSICAL CONSTANTS Name Symbol Value in S.I. Gravitational constant G 6.6720*10-11 N.m2.kg-2 Avogadro’s number NA 6.022045*1023 mol-1 Boltzman’s constant k 1.380662*10-23 J.K-1 Faraday’s number F 9.648456*104 C.mol-1 Electron charge e 1.6021892*10-19 C Electron rest mass me 9.109534*10-31 kg Speed of light in vaccum c 2.99792458*108 ms-1 Planck’s constant h 6.626176*10-34 J.s Rydberg constant Rα […]