The heat conductivity of helium is `8.7` times that of argon (under standard conditions). Find the radio of effective diameters of argon and helium atoms.

Knowing the viscosity coefficient of helium under standard conditions, calculate the effective diameter of the helium atom.

Helium diffuses 4 times faster than an unknown gas under similar conditions. Find the vapour density of unknown gas.

The dielectric permittivity of gaseous argon at standard conditions is 1.00054. Find the dipole moment of an argon atom in an electric field of 10 kV/m. Compare with the dipole moment of a water molecule.

Find the energy relased (in junles) when a doubly ionised helium (He^(2+)) taken up two electron in form a helium atom in the ground state .The first ionisation energy of a helium atom is 3.4 xx 10^(-19) J

Find the energy relased (in junles) when a doubly ionised helium (He^(2+)) taken up two electron in form a helium atom in the ground state .The first ionisation energy of a helium atom is 3.4 xx 10^(-19) J

Helium gas is filled in a closed vessel whose coefficient of thermal expansion is negligible. When it is heated from 300 K to 600 K, then find the average kinetic energy of helium atoms.

The radius of the first orbit of hydrogen atom is 0.52xx10^(-8)cm . The radius of the first orbit of helium atom is

The radius of the first orbit of hydrogen atom is 0.52xx10^(-8)cm . The radius of the first orbit of helium atom is