Physics, 25.08.2019 19:00 Jerry4891

Adecrease in the frequency of light from a galaxy would make the galaxy appear redder. t or f?

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Answer from: maddy121209

A decrease in the frequency of light from a galaxy would make the galaxy appear redder. The answer is True!

Answer from: bferguson7986

True

Explanation:

Decrease in the frequency means in increase in the wavelength of the light. It means that light is red-shifted.

A red shift in the spectrum of a galaxy indicates that it is receding away from the Earth. Red shift means a decrease in the frequency of the light received from the galaxy and increase in the wavelength. The wavelength shifts towards the red portion of the electromagnetic spectrum.

Thus, the given statement is true that the galaxy would appear redder if there is decrease in the frequency of the light received from the galaxy

Answer from: Quest

Is there a picture to go along with this

Answer from: Quest

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.

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