A football is kicked at 37.0^o to the horizontal at 20.0 m/s from the players hand at 1.00m from the ground. How far did the football travel before hitting the ground? with steps

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.

c. 195

explanation:

in the periodic table, platinum is the chemical element with atomic number 78. it means that it contains 78 protons in its nucleus, and 78 electrons in its orbitals.

there are several isotopes of the platinum, which determine its average mass number (and so its average atomic mass). the most abundant isotopes are:

platinum-194, platinum-195 and platinum-196, which have mass number of 194, 195 and 196, respectively.

considering all isotopes, the average mass number of platinum is 195, which means that on average platinum has 195 nucleons. since each nucleon has a mass of 1 u (1 atomic unit), the average atomic mass for platinum is 195.