Determining the sound level
Sound level within the church (1 m away from the chorus) while people are singing is around 100 dB (0.01 W/m^2). Suppose sound waves are released equally in all directions. Determine the sound level (in dB) 1 km away from church.
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A sample which is having 1.547-g of blue copper (II) sulfate penta hydrate, CuSO4 * 5 H2O is heated carefully to drive off the water. The white crystals of CuSO4 that are left behind have a mass of 0.989 g.
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The mass of the particle is around 6.64 x 10-27 kg. The particle employed in a scattering experiment consists of a kinetic energy of 7.30 x 10-13 J. Determine the de Broglie wavelength of the particle?
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Determine the work that would be done if the same expansion occurred isothermally and reversibly when a sample of methane of mass 4.50g occupies 12.7 L at 310K.
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