Which of the following is a common technique advertisers use to mislead consumers into using "fad diets" to achieve optimal health and fitness? promoting exercise promoting vegetables promoting fruits promoting supplements

Promoting supplements

Explanation:

A fad diets are the health supplements that can be used to promote the effective weight loss and other health advantages such as longer life. They are promoted for the claim that they loose weight by requiring little effort. The diet is associated with the restriction of other diets and unusual food choices along with the fad diets. These are associated with serious health issues.

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.