Maximum range of weather radar. One use of radio waves not explored in this to a target and uses the energy reflected from the target to deduce the target's chapter is in radar. One type of radar set sends short intense radio-wave pulses position, distance, and other information. Suppose a weather-radar antenna is placed on a tower that is 20m high. Assuming the radiation from the antenna barely grazes the horizon and then travels to a storm cloud at a height of 12km, what is the maximum distance d the storm cloud can be from the radar and still be visible at the horizon? Use an idealized perfectly spherical earth with a radius R of 6371 km.

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Interference of Light

The word "constructive" signifies addition in interference. Constructive interference occurs when the path of the waves that start from the slit differs by 1 entire wavelength or in the intervals of the same. Hence, the waves that are presented on the screen are in phase (crest to crest/trough to trough). The waves interfering constructively forms bright fringes on the screen.