Physics, 25.04.2020 03:22 timjape3g3z
The instantaneous expression for the magnetic field intensity of a uniform plane wave propagating in the +y direction in air is given by: = 4x10β6 cos [10 Οt β k0y + Ο 4 ] (A/m) a) Determine k0 and the location where Hz vanishes at t = 3 (ms) b) Write the instantaneous expression for E
Answers: 2
Physics, 21.06.2019 15:50
Electric charge is uniformly distributed inside a nonconducting sphere of radius 0.30 m. the electric field at a point p, which is 0.50 m from the center of the sphere, is 15,000 n/c and is directed radially outward. what is the maximum magnitude of the electric field due to this sphere
Answers: 2
Physics, 21.06.2019 18:20
What color would an object that reflects green and blue light appear to be in white light? a. blue b. cyan c. magenta d. black
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Physics, 21.06.2019 21:30
In what direction does the medium move relative to the direction of the wave? explain.
Answers: 3
Physics, 21.06.2019 22:30
Fft review: linspace, fs, fftshift, nfft 1. generate one second of a cosine of w,-10hz sampled at f, = 100hz and assign it to x. define a tt as your time axis 2. take 64 points fft. 3. as you remember, the dft (which the fft implements) computes n samples of s2t where k-0,1,2, n -1. plot the magnitude of this 64-points fft at range 0 to 63, what do you think of this graph? 4Γ’Β·to get the x-axis into a hz-frequency form, plot this 64-points fft between-50 to 50 (the 100hz sampling rate) and have n-points between them. 5. according to your figure, what frequency is this cosine wave at? 6. remember that the fft is evaluating from 0 to 2Δβ¬. we are used to viewing graphs from-Δβ¬ to Δβ¬. therefore, you need to shift your graph. 7. now according to your shifted graph. what frequency is this at? 8. note that the spikes have long drop-offs? try a 1024-point dft. note that the peak is closer to 10 and the drop-off is quicker. although, now sidelobes are an issue
Answers: 2
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