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If the heat of 120 J is added to gaseous system, whose internal energy is 50 J, then amount of external work done is —
540 J
100 J
70 J
40 J
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The work functions for metals A, B and C are respectively 92 eV, 0 eV and 5eV. According to Einstein’s equation, the metals which will emit photo electrons for a radiation of wavelength 4100Å is/are ___________
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The value of coefficient of volume expansion of glycerin is 5 × 10–4 K– The fractional change in the density of glycerin for a rise of 40°C in its temperature, is____________
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