A small helium-neon laser emits red visible light with a power of 5.20 mW in a beam that has a diameter of 2.50 mm . What is the amplitude of the electric field of the light? What is the amplitude of the magnetic field of the light? What is the average energy density associated with the electric field?
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A small helium-neon laser emits red visible light with a power of 5.20 mW in a beam that has a diameter of 2.50 mm .
What is the amplitude of the electric field of the light?
What is the amplitude of the magnetic field of the light?
What is the average energy density associated with the electric field?
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- FM radio wave at 150 MHz travels along the x-axis with a magnetic field polarized along the z axis, width Bmax = 10^-4 T. The wave is reflected οn metal surface which intersects vertically the course of the wave at position x = 0. After reflection, the electric field changes phase by 180o but its width as well as its magnetic field remains the same. a) Write the expressions for the electric and the magnetic field of the incident and reflected EM wave. b) Calculate the parameters λ, β, ω, Ε max, the intensity and density of energy per unit volume of the EM field, as well as the force exerted by the EM radiation on surface if it has an area of 500 m^2. (c = 3x10^8 m/s, μ0, ε0 known).An instructor's laser pointer produces a beam of light with a circular cross section of diameter 1.30 mm and an average power output of 8.00 mW. The beam size stays nearly constant when the instructor uses the laser pointer in the classroom. What is the amplitude Eo of the electric field of the laser's light? Eo= What is the amplitude Bo of the magnetic field of the laser's light? What is the average energy density wave of the laser's light? N/C Bo= T J/m³ WaveThe intensity of a particular TV station’s signal is I =1.01 x 10^(-13) W/m^2 when it arrives at a 28-cm diameter satellite TV antenna. A) Calculate the total energy received by the antenna during 5.0 hours and 40 minutes of viewing this station’s programs. B)What is the amplitude of the field of the EM waves? (E field)
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