A radar installation operates at 9000 MHz with an antenna (dish) that is 15 meters across. Determine the maximum distance (in kilometers) for which this system can distinguish two aircraft 100 meters apart
a. 7.4 km
b. 370 km
c. 3700 m
d. 37 km
e. 740 km
d
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A beam of photons of wavelength 0.55 nm undergoes Compton scattering from free electrons.What is the energy of the photons that emerge at a 35° angle with respect to the incident beam?
a. 2.3 keV b. 10.9 keV c. 36.0 keV d. 3.0 keV
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A child sits on a swing supported by ropes of length 4.0 m. With what frequency will she need to apply the driving force to maintain swinging?
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