The frequency of a light wave in a material is 3 × 1014 Hz and the wavelength is 6000 Å. What is the refractive index of the material?
$\dfrac{3}{2}$
$\dfrac{4}{3}$
$\dfrac{5}{3}$
$\dfrac{3}{5}$
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If two gases of molecular weights M1 and M2 are at same pressure and temperature, ratio of their r.m.s. speed will be