A point source emits electromagnetic energy at a rate of (1.0028x10^2) Joules per second. What is the intensity of the electromagnetic radiation (9.97x10^0) m from the source? Express your result with three significant figures in mW/m².
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- A traveling electromagnetic wave in a vacuum has an electric field amplitude of 92.9 V/m. Calculate the intensity S of this wave. Then, determine the amount of energy U that flows through area of 0.0279 m? over an interval of 18.1 s, assuming that the area is perpendicular to the direction of wave propagation. S = W/m? U = JQuestion 7: Part (a) Determine the amplitude in units of volts per meter. A = ______V/m Part (b) Determine the frequency in units of hertz. f = ______ Hz Part (c) Determine the wavelength in units of centimeters. λ = ______ cmWhat is the frequency of the most intense radiation emitted by your body? Assume a skin temperature of 95°. Group of answer choices 1.81 x 10^13 Hz 6.43 x 10^14 Hz 1.65 x 10^13 Hz 3.18 x 10^14 Hz
- (a) Approximately how long would it take a telephone signal to travel 2810 mi from coast to coast across the United States? (Telephone signals travel at about the speed of light.) b) Approximately how long would it take a radio signal to reach the International Space Station (ISS) at an orbital altitude of 350 km?If the intensity of sunlight at the Earth's surface under a fairly clear sky is 1 289 W/m2, how much electromagnetic energy per cubic meter is contained in sunlight? µJ/m3A common short-wave radio broadcast band has a wavelength of 49m. What is its frequency?
- A planar electromagnetic wave is propagating in the -x direction. At a certain point P and at a given instant, the electric field of the wave is given by E = (1.27 V/m) ĵ. What is the magnitude and direction of the magnetic field vector of the wave (in nT) at the point P at that instant? Denote the +z direction as positive, and the -z direction as negative. (Use c = 2.9979 × 108 m/s) nT(a) The distance to a star is approximately 4.97 × 10¹8 m. If this star were to burn out today, in how many years would we see it disappear? years (b) How long does it take sunlight to reach Earth? minutes (c) How long does it take for a microwave radar signal to travel from Earth to the Moon and back? (The distance from Earth to the Moon is 3.84 x 105 km.) SA point source emits electromagnetic energy at a rate of (9.93x10^1) Joules per second. What is the intensity of the electromagnetic radiation (9.8070x10^0) m from the source? Express your result with three significant figures in mW/m2. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 Answer Hide hint for Question 1 Calculate the wave intensity at the specified distance.
- A distant galaxy emits light that has a wavelength of 655.6 nm. On earth, the wavelength of this light is measured to be 661.9 nm. (a) Decide whether this galaxy is approaching or receding from the earth. (b) Find the speed of the galaxy relative to the earth. (Give your answer to 4 significant digits. Use 2.998 × 108 m/s as the speed of light.)(a) Suppose a star is 8.59 x 1018 m from Earth. Imagine a pulse of radio waves is emitted toward Earth from the surface of this star. How long (in years) would it take to reach Earth? years (b) The Sun is 1.50 x 1011 m from Earth. How long (in minutes) does it take sunlight to reach Earth? minutes (c) The Moon is 3.84 x 108 m from Earth. How long (in s) does it take for a high-intensity laser beam to travel from Earth to the Moon and back?At a certain geographic location, light intensity from the Sun is 900 J/(m² .s). This means that sunlight delivers 900 joules of energy to each square meter of ground in each second. Suppose solar panels are installed on the roof of a house to generate electricity from sunlight. The total area of the solar panels is 25 m². Calculate the maximum electric energy that can be generated per second: Unfortunately, solar panels are not 100% efficient at converting electromagnetic energy to electricity. Suppose the solar panels have an efficiency of 15%. This means that only 15% of the electromagnetic energy incident on the solar panels is converted to electricity, while the rest is reflected or converted to thermal energy. Given this efficiency, calculate the electric energy that can be generated per second: