314338 The density of a gas electric lamp is \(\mathrm{0.75 \mathrm{~kg} / \mathrm{m}^{3}}\). After the lamp has been switched on, the pressure in it increases from \(\mathrm{4 \times 10^{4} \mathrm{~Pa}}\) to \(\mathrm{9 \times 10^{4} \mathrm{~Pa}}\). What is increase in \(\mathrm{U_{R M S}}\) ?