The heat pump is designed to move heat. this is only possible if certain relationships between the heats and temperatures at the hot and cold sides hold true. indicate the statement that must apply for the heat pump to work. the heat pump is designed to move heat. this is only possible if certain relationships between the heats and temperatures at the hot and cold sides hold true. indicate the statement that must apply for the heat pump to work. qhqc and thtc. qh> qc and th> tc. request answer part e assume that you heat your home with a heat pump whose heat exchanger is at tc=2∘c, and which maintains the baseboard radiators at th=47∘c. if it would cost $1000 to heat the house for one winter with ideal electric heaters (which have a coefficient of performance of 1), how much would it cost?

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scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle  

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.