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qUESTIONS

A thin square steel plate with each side equal to 10 cm is heated by a blacksmith. The rate of radiated energy by the heated plate is 1134 W. The temperature of the hot steel plate is (Stefan’s constant σ = 5.67 × 10^-8 watt m^-2 K^-4 emissivity of the plate = 1)

The maximum wavelength of radiation at 2000 K is 4 µm. What will be the maximum wavelength emitted at 2400 K

The change in volume V with respect to an increase in pressure P has been shown in the figure for a non-ideal gas at four different temperatures T1, T2, T3 and T4. The critical temperature of the gas is

The graph which represents the variation of mean kinetic energy of molecules with temperature t°C is

The pressure is exerted by the gas on the walls of the container because

Gas at a pressure Po is contained in a vessel. If the masses of all the molecules are halved and their speeds are doubled, the resulting pressure P will be equal to

For a gas if Ɣ= 1.4, then atomicity, Cp and Cv of the gas are respectively

A gaseous mixture consists of 16 g of helium and 16 g of oxygen. The ratio Cp/Cv of the mixture is

10 moles of an ideal monoatomic gas at 10°C is mixed with 20 moles of another monoatomic gas at 20°C. Then the temperature of the mixture is

Two moles of oxygen is mixed with eight moles of helium. The effective specific heat of the mixture at constant volume is

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