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qUESTIONS

Calculate the energy radiated in one minute by a blackbody of surface area 200 cm² at 127 °C ( σ = 5.7 x 10Jm²s⁻¹K).

Calculate the value of λmax for solar radiation assuming that surface temperature of Sun is 5800 K(b=2.897 x103m K). In which part of the electro magnetic spectrum, does this value lie ?

Calculate the average molecular kinetic energy (i) per kmol (ii) per kg (iii) per molecule of oxygen at 127 °C, given that molecular weight of oxygen is 32, R is 8.31 J mol K-¹ and Avogadro’s number N is 6.02 * 10² 23 molecules mol-¹.

Find kinetic energy of 5 litre of a gas at S.T.P. given standard pressure is 1.013 × 105 N/m².

Compare the rms speed of hydrogen molecules at 127 °C with rms speed of oxygen molecules at 27 °C given that molecular masses of hydrogen and oxygen are 2 and 32 respectively.

At what temperature will oxygen molecules have same rms speed as helium molecules at S.T.P.? (Molecular masses of oxygen and helium are 32 and 4 respectively)

Show that rms velocity of an oxygen molecule is sqrt(2) times that of a sulfur dioxide molecule at S.T.P.

A gas in a cylinder is at pressure P. If the masses of all the molecules are made one third of their original value and their speeds are doubled, then find the resultant pressure.

Two vessels A and B are filled with same gas where volume, temperature and pressure in vessel A is twice the volume, temperature and pressure in vessel B. Calculate the ratio of number of molecules of gas in vessel A to that in vessel B.

Calculate the ratio of mean square speeds of molecules of a gas at 30 K and 120 Κ.

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