Calculate the wavelength and frequency of an electron when there is a quantum jump from n=1 Assume
E=-13.6eV/n
1eV = 1.6 x10-19
1.6 x10-19 n is the quantum number] )
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The earth remains in orbit around the sun due to the force of gravity. how does the force of gravity exerted by the sun on the earth compare to the force of gravity exerted by the earth on the sun?

Holes drilled several kilometers into earth’s crust provide direct evidence about earth’s interior in the form of

Arefrigerator uses r-134a as the working fluid and operates on the ideal vapor-compression refrigeration cycle except for the compression process. the refrigerant enters the evaporator at 120 kpa with a quality of 34 percent and leaves the compressor at 70°c. if the compressor consumes 450 w of power, determine (a) the mass flow rate of the refrigerant, (b) the condenser pressure, and (c) the cop of the refrigerator. (0.00644 kg/s, 800 kpa, 2.03)