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Consider two dimensional square lattice site of side 0.5nm.At what electron
momentum values do the sides of the first Brillouin zone come? What is the
energy of free electron with this momentum.
A solution of salt water raised the boiling point of water from a 100°C to 102.5°C. What is the molality of the solution? Assume the Kb of water is 0.51°C/m.
One end of a copper poker is placed in a fire with temperature of 600°C, while the other end is kept at room temperature (25°). The poker is 1,5 m long and has a radius of 3 x 10-3 m.
A liquid of unknown specific heat at a temperature of 20oC was mixed with water at 80oC in a well-insulated container. The final temperature was measured to be 50oC, and the combined mass of the two liquids was measured to be 240g. In a second experiment with both liquids at the same initial temperatures, 20 g less of the liquid of unknown specific heat was poured into the same amount of water as before. This time the equilibrium temperature was found to be 52oC. Determine the specific heat of the liquid.
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Neon gas is used in manufacturing to create signs. If you run an electric current through the gas,
it will glow in neon colors. Unfortunately, when you run electricity through the gas, its
temperature increases. If the temperature starts at 50⁰C, it will raise to about 150⁰C after the
sign is on for 4 hours. The gases original volume was 5 L. What is the volume of the gas after
the sign is on for 4 hours
1. A copper cube with sides of length 40mm had its surface blackened. The cube is heated up to 500K and place inside a room at a constant temperature of 300K. Calculate the initial rate of temperature fall of the cube, assuming it is a perfect blackbody. Take S.H.C of Aluminium to be 400J/kg/K, density of aluminium-7800kg/m'.
At what ocean depth is the liquid pressure equal to 152 cm Hg? What is the absolute pressure at that depth? Density of the sea water is 1030 kg/m³
Airplane normally fly at altitude of 36000 ft. Find the atmospheric pressure at that altitude.
1. A 92 kg/s flow of steam enters a turbine at 100 bar, 774 K and a velocity of 35 m/s. The machine is well insulated and the steam leaves at 0.1 bar, 365 K and at a velocity of 350 m/s. Calculate the power output from the turbine and the inlet and outlet pipe diameters required assuming that steam is an ideal gas with Cp=1901 J/kg.K.
A copper cube with sides of length 40mm had its surface blackened.the cube is heated up to 500k and place inside a room at a constant temperature of 300k.calculate the initial rate of temperature fall of the cube, assuming it is a perfect blackbody.take SHC of aluminium to be 400j/kg/k, density of aluminium=7800kg/m3
