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- A radio station broadcasts its radio waves with a power of 50,000 W. What would be the intensity of this signal if it is received on a planet orbiting Proxima Centuri, the closest star to our Sun, at 4.243 ly away?A Doppler weather radar station broadcasts a pulse of radio waves at frequency 2.85 GHz. From a relatively small batch of raindrops at bearing 38.6 east of north, the station receives a reflected pulse after 180 s with a frequency shifted upward by 254 Hz. From a similar batch of raindrops at bearing 39.6 east of north, the station receives a reflected pulse after the same time delay, with a frequency shifted downward by 254 Hz. These pulses have the highest and lowest frequencies the station receives, (a) Calculate the radial velocity components of both batches of raindrops. (b) Assume that these raindrops are swirling in a uniformly rotating vortex. Find the angular speed of their rotation.A meteorologist is using radar to measure the distance to a storm. reception of the radar pulse is 0.23 ms. How far away is the storm? (in km) The time difference between transmission and OA: 3.71 | OB: 5.38 OC: 7.80 OD: 11.31 OE: 16.40 OF: 23.78 OG: 34.48 OH: 49.99
- What is the threshold frequency? Vo 4 5 6 7 8 v 104 Hz O a. 8x 1014 Hz O b. 5x 1014 Hz O c. 2 x 1014 Hz O d. 1x 1014 Hz1. The CT signal x(t)=6cos (800rt) + 8cos? (mat) is critically sampled (Nyquist rate) by f-8000 Hz. Find: i. The value of m.What is the ratio in frequency of violet light (400 nm) to red light (750 nm)? fv is frequency of violet light, fr is the frequency of red light fr = 1.875 fv fr = 0.533 fv fr = 3.238 fv fr = 0.324 fv
- Calculate the Bandwidth for the following angle modulated signal Xc(t)= 10 Cos (2m*10A8t + 200 cos 2m*10A31). Select one: а. 400KHZ b. 250KHZ с. 200КHZ d. 300KHZ e. 1000HZWhat is the frequency of infrared light emitted by an LED in a remote control with a wavelength of 906 nm if the speed of light is given as c= 3.00 x 108 m s-1. Give your answer in Hz to an appropriate number of significant figures.Determine the minimum transmission BW in a (FDM/AM & SSB) system transmitting 30 different messages, each message signal have BW of 4 kHz.
- The maximum frequency deviation for the FM signal v(t)-5 cos(6000t+ 10sin2200t) is 1750 Hz 750 Hz 3500 Hz none of the given answersQUESTION 24 The speed of light on a particular form of plastic fiber is 2.90 x 10^8 m/s. A lightwave with 1,340 nm wavelength is sent down the fiber. What frequency would that be? 2.10 x 10^11 Hz O 2.10 x 10^14 Hz O.2.16 x 10^11 Hz O 2.16 x 10^14 HzFrequency range: 4.286x10¹4 -7.895x10 F = ** 3. One type of radar works by sending a pulse out to and object and timing how long it takes for the pulse to return after bouncing off of the object. If the radar is tracking a plane 100 km away, how long does it take from the time the pulse leaves the radar to the time it returns? 2/4 V + 3.33x10 4. Radar antenna tend to be of comparable size to their wavelength. The radiation used by radar ranges from 300 Mhz to 15 Ghz. a. What is the range of wavelengths? b. If the antenna dimensions are comparable to the wavelength of the radiation used, what will be the approximate size range of antenna used for radar? 5. When used for imaging, the wavelength of the radiation needs to be smaller than the thing being imaged. To a get a pretty good idea of what kind of radiation is needed to image something assume that the wavelength must be the size of the object or smaller. With this in mind, would visible light work well to image protozoa with a…