Which one of the following lists is a correct representation of electromagnetic

Question

Which one of the following lists is a correct representation of electromagnetic waves horn longer wavelength to shorter wavelength? radio waves, UV, X-rays, microwaves, infrared, visible, gamma rays radio waves, microwaves, infrared, visible, UV, X-rays, gamma rays radio waves, infrared, microwaves, UV, visible, X-rays, gamma rays radio waves, microwaves, visible, X-rays, infrared, UV, gamma rays E) radio waves, infrared, X-rays, microwaves, UV, visible, gamma rays In an electromagnetic wave, the electric and magnetic fields are oriented such that they are perpendicular to one another and perpendicular to the direction of wave propagation. perpendicular to one another and parallel to the direction of wave propagation. parallel to one another and perpendicular to the direction of wave propagation. parallel to one another and parallel to the direction of wave propagation. An 800 kHz radio signal is detected at a point 3.1 km distant from a transmitter tower. The field amplitude of the signal at that point is 160 mV/m. Assume that the signal power is radiated uniformly in all directions and that radio waves incident upon the ground are completely absorbed. The intensity of the radio signal at that point is closest to: 6.8 Times 10^5 W/m^2 4.8.10^-5 W/m^2 1.7 Times 10^-5 W/m^2 2.4 Times 10^-5 W/m^2 3.4 Times 10^-5 W/m^2

Explanation / Answer

6) B

7) A

8) E) 3.4*10^-5 W/m^2

Given, Emax = 160 mV/m

= 0.16 V/m

Intensity of light wave, I = Emax^2/(2*c*mue)

= 0.16^2/(2*3*10^8*4*pi*10^-7)

= 3.4*10^-5 W/m^2

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