Question on standing/stationary waves

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The discussion revolves around the interference of radio waves transmitted from two navigation beacons 60km apart, with a wavelength of 4000m. As the ship moves towards one beacon, it experiences a pattern of constructive and destructive interference due to the phase and amplitude of the signals. The user speculates that there would be 15 waves in the 60km distance, indicating a misunderstanding of the wave interaction. Suggestions include using simulations to visualize the interference patterns more clearly. Understanding these concepts is crucial for determining how the signals will be received on the ship over the next 6km.
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Homework Statement



Two navigation beacons 60km apart transmit radio waves of wavelength 4000m. The signals start with the same phase and amplitude. A ship is midway between them and is sailing straight towards one of them. Describe what happens to the signals received on board the ship over the next 6km.

Homework Equations


v=f x lambda ?


The Attempt at a Solution


Um... I just don't really get it...
I was thinking along the lines that there would 15 waves in the 60km...?
 
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The two sources create a pattern of constructive and destructive interference.
You could draw it with a compass or take a look at a simulation - there are many on the web like this one: http://www.ngsir.netfirms.com/englishhtm/Interference.htm
 
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Thread 'Correct statement about size of wire to produce larger extension'

Thread 'Correct statement about size of wire to produce larger extension'

The answer is (B) but I don't really understand why. Based on formula of Young Modulus: $$x=\frac{FL}{AE}$$ The second wire made of the same material so it means they have same Young Modulus. Larger extension means larger value of ##x## so to get larger value of ##x## we can increase ##F## and ##L## and decrease ##A## I am not sure whether there is change in ##F## for first and second wire so I will just assume ##F## does not change. It leaves (B) and (C) as possible options so why is (C)...
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