A lidar gun is an alternative to the standard radar gun

Assignment Help Physics

Reference no: EM13656279

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 timed 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 is a stationary police car observes a difference of 1.21 x 10^-7 s in round-trip travel times for two pulses that are emitted 0.430 s apart. Assuming that the speeding vehicle is approaching the police car essentially head-on, determine the speed of the vehicle.

Reference no: EM13656279

Questions Cloud

What fraction of the power radiated by the sun : What fraction of the power radiated by the sun is intercepted by the planet Mercury? The radius of Mercury is 2.44 x 106 m, and its distance from the sun at the moment is 5.80 x 1010 m. Assume that the sun radiates uniformly in all directions.

Eyeglasses-how far is her near point from her eyes : A farsighted woman breaks her current eyeglasses and is using an old pair whose refractive power is 1.990 diopters. Since these eyeglasses do not completely correct her vision, she must hold a newspaper 42.00 cm from her eyes in order to read it.

What is the angular magnification of the telescope : An amateur astronomer decides to build a telescope from a discarded pair of eyeglasses. One of the lenses has a refractive power of 11 diopters, while the other has a refractive power of 1.1 diopters.

What is the spaceships kinetic energy : Suppose a 1.17×104 kg spaceship left Earth at a speed of 0.90c. What is the spaceship's kinetic energy? Compare with the total U.S. annual energy consumption (about 10^20 J).

A lidar gun is an alternative to the standard radar gun : 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 timed series of pulses of infrared electromagnetic waves.

Capacitor to lose half its initial stored energy : A capacitor of capacitance C = 4 mC is discharged through a resistor of resistance R = 4 k?. How long will it take for the capacitor to lose half its initial stored energy?

Battery of emf what is the value of the current in circuit : A capacitor of capacitance C = 6 ?F is connected in series with a resistor R = 5 M? to a battery of emf What is the value of the current in the circuit when the capacitor has reached 20% of its maximum charge?

Experimentally balancing an equilibrium system : Suppose in a situation like m1 = 200g were at the 20-cm position and m2 = 100g at the 65-cm position. Would there be a problem in experimentally balancing an equilibrium system with m3 = 50g? Explain. If so, how might the problem be resolved?

Every morning and weigh yourself on your scales : Assume you are a fish. You get up every morning and weigh yourself on your scales, and find you weight 0.42N. You, being a boxfish, are a box measuring 4.174 cm per side. You see a poor, hungry fisherman, and decide to be his dinner.

User Account

All Pages