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02-26-2008, 10:25 PM
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| Tricky Physics Problem?
A lidar (laser radar) gun is an alternative to the standard radar gun that uses the Doppler effect to catch speeders. A lidar gun uses an infrared laser and emits a precisely times series of pulses of infrared electromagnetic waves. The time for each pulse to travel to the speeding vehicle and return to the gun is measured. In one situation a lidar gun in a stationary police car observes a difference of 1.31 x10^-7 s in round-trip times for two pulses that are emitted 0.490 s apart. Assuming that the speeding vehicle is approaching the police car essentially head-on, determine the speed of the vehicle. ?m/s      |
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