Assume that a light emitting diode (LED) emits a power P uniformly distributed over its forward hemisphere and zero power in its rear hemisphere. Model the light waves from the LED as being sinusoidal.   (a) What is the amplitude of the wave’s electric field at a distance R?   (b) Calculate the numerical value of the electric field amplitude if P = 10 W and R = 3.0 m.

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Nature of light

Light is transverse and electromagnetic radiation that exhibits the properties of a wave as well as a particle. For this reason, light is said to have a “dual nature.”