Physics, 14.10.2019 00:30 joe7977

What are some similarities and differences between electromagnetic waves and mechanical waves

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The similarity is they all follow a partial differential wave equation, usually second order. The differences mainly arise from the physical reasons for the wave.

Mechanical waves arise through energy being imparted to the medium, and when one part is displaced, it pushes or pulls on an adjacent part, and the energy density moves with the phase velocity (the velocity at which constant phase moves through the medium.)

Electromagnetic waves involve a burst of oscillating electric field, and as it oscillates, it generates, following Maxwell, an oscillating magnetic field, which in turn generates further electric field oscillations.

I hope this helped. I have really had to use this for anything since I learned it but I hope it helps you.

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b.a device that inputs heat into a cool object

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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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What are some similarities and differences between electromagnetic waves and mechanical waves...