Question

In a constant volume gas thermometer, the pressure of liquid, at a temperature of 27°C, being measured corresponds to 50cm of mercury. If the temperature increases by 20K, find the pressure.

(a) 53.33cm

(b) 87.03cm

(c) 65.33cm

(d) 97.03cm

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This is a very interesting question from Thermal Properties of Matter topic in portion Thermal Properties of Matter of Physics – Class 11

Answer 1

Right choice is (a) 53.33cm

To elaborate: For a constant volume gas thermometer, P/T =  constant.

P1/T1 = P2/T2                                                                                                                                                                 ∴ P2 = P1/T1 * T2 = 50/300 * 320 = 53.33cm.