Two experimental runs are performed to determine the calorimetric properties of an alcohol which has a melting point of -10.0 C.
In the first run, a 200-g cube of frozen alcohol, at the melting point, is added to 300 g of water at 20.0C in a styrofoam container. When thermal equilibrium is reached, the alcohol-water solution is at a temperature of 5.0C. In the second run, an identical cube of alcohol is added to 500 g of water at 20.0C and the temperature at thermal equilibrium is 10.0C. The specific heat capacity of water is 4190 J/kg K. Assume no heat is exchanged with the styrofoam container and the surroundings. What is the heat of fusion of the alcohol?
A) 7.1 104 J/kg
B) 7.9 104 J/kg
C) 5.5 104 J/kg
D) 6.3 104 J/kg
E) 8.7 104 J/kg
Question 2
In a particular case of Compton scattering, a photon collides with a free electron and scatters backwards. The wavelength after the collision is exactly double the wavelength before the collision.
What is the wavelength of the incident photon? (mel = 9.11 10-31 kg, h = 6.626 10-34 J s, c = 3.00 108 m/s)
A) 6.0 pm B) 2.4 pm C) 4.8 pm D) 3.6 pm E) 1.2 pm
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