Physics, 06.08.2021 20:50 alisonlebron15
A 1.00 g charcoal sample from an ancient fire has a 14C activity of 11.2 disintegrations/min. A living tree has a 14C activity of 15.3 disintegrations/min per gram. The half-life of 14C is 5730 y. How old is the charcoal sample?
Answers: 1
Physics, 21.06.2019 21:00
To protect all four receptacles on a branch circuit that surrounds a swimming pool, you would install which of the following configurations? a. gfci feed-through receptacle at the end of the load's circuit b. gfci-terminated receptacle at the beginning of the load's circuit c. gfci feed-through receptacle at the beginning of the load's circuit and the other receptacles connected to the load side of that receptacle d. gfci-terminated receptacle at each end of the load's circuit
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
Physics, 22.06.2019 05:30
Suppose you have three polarizing filters, with the second at an angle of 42β to the first and the third at an angle of 90β to the first. by what perfect will the original intensity of unpolarized light be reduced to after passing through all three filters?
Answers: 2
A 1.00 g charcoal sample from an ancient fire has a 14C activity of 11.2 disintegrations/min. A livi...
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