Consider the diagram of the electromagnetic spectrum shown below. Notice the locations of X-rays and radio waves. X-rays are often used in medical settings to create images of the body's internal structures such as bones. This is made possible by the fact that X-rays are able to pass through the body's softer tissues without being absorbed. Radio waves are also able to pass through the body's softer tissues without being absorbed. Why are radio waves not used to generate medical images?
A. The frequency of most radio waves is too low to allow them to pass through bones or other solid materials.
B. Radio waves tend to bend too much when they encounter solid materials to be used for generating accurate images.
C. Radio waves carry so little energy that they tend to pass through most atoms without an interaction taking place.
D. The electrons in most atoms are not in high enough energy states to absorb the photons of radio waves

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.

gravitational energy

electrical energy

kinetic energy

ligh energy