A point source emits electromagnetic energy at a rate of (1.034x10^2) Joules per second. What is the intensity of the electromagnetic radiation (1.01x10^1) 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: Answer x10
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- A special black material absorbs all light incident upon it. An intense laser beam shines straight up onto a horizontally flat object made out of this material. If the object has an area of 1.0 m² and a mass of 1.0 kg, how much power does the laser need to generate in order to accelerate it upward at a rate that is two times the freefall acceleration of gravity, 2g?Question 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 = ______ cmTwo girls with two-way radios are at the intersection of two country roads that meet at a 105° angle (see the figure). One begins walking in a northerly direction along one road at a rate of 5 mi/hr at the same time the other walks east along the other road at the same rate. If each radio has a range of 10 miles, how long will the girls maintain contact?
- What 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 HzA 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.Let's try a few more examples that relate power and energy. A certain high-efficiency LED light bulb has a power output of 9.20 W. That is, 9.20 J of electric energy is converted to electromagnetic (light) energy and radiated away every second. How much energy is output by the lightbulb if it is left on for a total time of 7.50 hours? In this case, we're relating power to energy change, so we simply use the relationship E t P = Here, instead of work W, we use in the equation E, which is the amount of energy output or converted in the amount of time t. From this, what do we find the total energy output in joules to be? 33120 X x Solve the above equation for the energy E in terms of power P and time t. Remember that 1 W = 1 J/s, so to find the energy in joules, convert the time to seconds first. There are 60 minutes in one hour and 60 seconds in one minute. J
- An AM radio station broadcasts with a frequency of 829 kHz. The height of its broadcast antenna is one-quarter of the wavelength. Find the height (in m) of the antenna.The frequency range for AM radio is 540 to 1600 kHz. The frequency range for FM radio is 88.0 to 108 MHz. Part (a) Caculate the maximum wavelength for AM radio in meters. Part (b) Caculate the minimum wavelength for AM radio in meters. Part (c) Caculate the maximum wavelength for FM radio in meters. Part (d) Caculate the minimum wavelength for FM radio in meters.A common property of all waves is the relationship between the speed of light (c), the wavelength (λ), and the frequency of the wave (f). The correct equation for this relationship is which of the following? Group of answer choices c = f λ λ = c f f = c λ c=f/a
- 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) nTA distant galaxy emits light that has a wavelength of 617.7 nm. On earth, the wavelength of this light is measured to be 623.6 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) The galaxy is (b) Number ◆ from the earth Units ✪A 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.