What is an electromagnetic wave? Describe some evidence supporting the idea that

Question

What is an electromagnetic wave? Describe some evidence supporting the idea that light is an electromagnetic wave. Figure 32.13 on pg. 1061 in the textbook shows a representation of a simple EM wave, similar to one that would be produced by a laser. Draw your own version of this diagram and clearly add the following to it: (If any of these can't be added to the diagram explain why they can't.) The amplitude of the EM wave. The wavelength of the EM wave. The frequency of the EM wave. What everyday property of light is most directly related to the amplitude of an EM wave? What everyday property of light is most directly related to the frequency of an EM wave? How is the wavelength of an EM wave related to this same everyday property? Based on your answers to questions 3 and 4, which physical quantity is related to the energy carried by an EM wave, the amplitude of the wave or the frequency/wavelength of the wave. Explain your reasoning.

Explanation / Answer

The modelling of light has been started with Newton as particles which is not able to explain the reflection, refraction and diffraction. To rectify these problems, Huygen's wave theory has been proposed according to which light is modelled as electromagnetic wave.

Electromagnetic wave is a energy carring pulse in the form of electric and magnetic fields.

The best experiment that proves the wave nature of light is Youngs double slit experiment. So interference, diffraction and polarization are the best phenamena for proving wave nature.

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