-No work or wrong answers will lead to no points AM radio signals are broadcast

Question

-No work or wrong answers will lead to no points

AM radio signals are broadcast at frequencies between 550 kHz and 1600 kHz and travel 2.99792 x 108 m/s. What is the shortest AM wavelength? What is the longest AM . ,wavelength? FM frequencies; range between 88 MHz and 108 MHz and travel at the same speed. What is the shortest FM wavelength? What is the longest FM wavelength? 20 waves crash onto a beach every 53.5 s. What is their frequency? At state trooper's car sends out a radar signal at a frequency of 13.4 GHz. Find the wavelength of this signal. The wave speed is 2.998 x 108 m/ s. What is the frequency corresponding to a period of 10.01 s? Radio waves travel at the speed of light: 3 x 105 km/s. What is the wavelength of radio waves received at 105.5 MHz on your FM radio dial? A harmonic wave travels in a wire with amplitude 3.64 mm, and frequency 378 Hz. What is the speed with which the wave travels? What requires a physical medium in which to travel? Earthquakes produce two kinds of seismic waves: he longitudinal primary waves (called P waves ) and the transverse .secondary waves(called S waves). Both S waves and P waves travel through Earth's crust and mantle, but at different speeds; the P waves are always faster than the S waves, but their exact speed depend on depth and location. For the purpose of this exercise we assume the P wave's peed to be 8380 m/s while the S waves travel at a slower speed of 4590 m/s. If a seismic station detects) a P wave and then 41.8 s later detects an S wave, how far away is the earthquake center? A wave is sent along a long: spring by moving the left end rapidly to the right and keeping is there. The figure shows the wave pulse at QR - part RS of the long spring is as yet undisturbed.

Explanation / Answer

1. shortest wavelength means biggest frequency
lambda = v/f = 2.99792E8/1600.0E3=187.37m

2. lambda = 2.99792E8/550.0E3 = 545 m

3. lambda = 2.99792E8/108.0E6 =2.78 m

4. lambda = 2.99792E8/88.0E6 = 3.41 m

5) f = number/time = 20/53.5= 0.374 m

6) wavelength = 2.998E8/13.4E9=0.0224 m

7) f = 1/T = 1/10.01 = 0.0999 Hz

8) wavelength = 3.0E8/105.5E6= 2.84 m

9) v = lambda f = 0.691*378= 261 m/s

10)3. sound

11) dt = t s - t P

41.8 = d/4590 - d/8380
d=4.24E5 m = 4.24E2 km = 424 km

12) is cut off

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