Study Guide: spring 2017 Technology EE-1301: Modern Electron 39, Two wave pulses

Question

Study Guide: spring 2017 Technology EE-1301: Modern Electron 39, Two wave pulses one with positive amplitude the other with equal negative on approaching each other, what is the result of the oscillations when the pulses same point? A It is constructive interference with twice the amplitude BOlt is destructive interference with zero amplitude C It is constructive interference with slightly greater amplitudi D. It is constructive interference with the negative amplitude E. The standing wave is produced 40. A pulse train has a period of 45 ms. Its frequency is A 6.66 Hz B, 44.44 Hz C, 22.22 kHz D. 22.22 Hz 41. The frequency of a pulse train is 4 kHz. The pulse period is A. 5 ms Dr B, 250 ms 250 US 42. Given a baseline pressure of2.94 x 10 psi, how many dB will a pressure wave of 9.2345 x 10 psi measure? A. 69.9 dB B. 51.4 dB C, 34.9 dB D. 84.1 dB frequency is: 43. A signal has a period of 20 ms. Its A. 50 MHz B. 20 kHz C. 50 Hz D. 2 Hz v.3

Explanation / Answer

Q39. Ans B ( As marked by you)

Q40. f=1/T=1/(45*10^-3)=22.22 Hz Ans. D

Q41.Ans D, T=1/f

Q42. Ans =20 Log(9.2345*10^-6/2.94*10^-9) =69.9 db...Ans A

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