The following problem will slowly guide you through a work calculation. some questions may appear trivial, so trust your instincts and don't assume there are hidden tricks. the goal of such a guided exercise is to you picture the situation so you understand how all relevant variables change or stay the same. this is the first in a sequence of related problems. remember to use three significant figures for all numerical answers. the margin of error for each numerical answer is 5%. to avoid rounding errors use the unrounded intermediate values in your final calculations. let's assume the initial volume of the gas is 1.70 l the initial temperature of the gas is 27.0 degree c and the system is in equilibrium with an external pressure of 1.2 bar (given by the sum of a 1 bar atmospheric pressure and a 0.2 bar pressure due to a brick that rests on top of the piston). how many moles of gas are there in the container? what happens with the piston while you heat the gas?

gravity

explanation:

where’s the list ? the question is incomplete

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.

where is the photo and the answer choices?