Police use radar guns and the Doppler effect to catch speeders. A radar gun emits an...
Police use radar guns and the Doppler effect to catch speeders. A radar gun emits an electromagnetic wave that reflects from the oncoming car. The reflected wave returns to the police car with a frequency (measured by on-board equipment) that is different from the emitted frequency. If one such radar gun emits a wave whose frequency is 10.5 GHz. A frequency of 2.46 GHz is picked up by the radar gun when a hot shot in a sports car goes speeding towards the officer. Calculate the velocity of the speedster by factoring in a temperature of 20Celcius.
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Police use radar guns and the Doppler effect to catch speeders.
A radar gun emits an...
The police use radar guns and the Doppler effect to catch violators. A police car is...
The police use radar guns and the Doppler effect to catch violators. A police car is driving from right to left at 50 km / h, another man's car is driven at a speed of 150 km / h away from the police car in the same direction. A police radar gun emits an electromagnetic wave whose frequency is 5.0 × 107 Hz that is reflected from the oncoming car. What is the difference between the frequency of the wave...
The radar gun of a police car emits an electromagnetic wave with a frequency of 7.5x10°Hz....
The radar gun of a police car emits an electromagnetic wave with a frequency of 7.5x10°Hz. The wave from the gun reflects from a speeding car and returns to the police car, where on board equipment measures its frequency to be greater than the emitted wave by 6.4 kHz. What is (1, 1,
A police officer's radar gun emits radio waves at a frequency of 11.1 GHz. What is...
A police officer's radar gun emits radio waves at a frequency of
11.1 GHz. What is the difference in the frequencies reflected back
to the radar gun by a car traveling at the 35 mph speed limit and a
car traveling 9 mph faster? Assume that the cars are both headed
directly away from the stationary officer.
A police officer's radar gun emits radio waves at a frequency of 11.1 GHz. What is the difference in the frequencies reflected back...
A police officer's radar gun emits radio waves at a frequency of 10.9 GHz . What...
A police officer's radar gun emits radio waves at a frequency of 10.9 GHz . What is the difference in the frequencies reflected back to the radar gun by a car traveling at the 65 mph speed limit and a car travelling 5 mph faster? Assume that the cars are both headed directly away from the stationary officer.
A police radar gun operates at an emitted frequency of 10 GHz (10 x 109 Hz)....
A police radar gun operates at an emitted frequency of 10 GHz (10 x 109 Hz). The police officer aims his radar toward a speeding car moving directly away from him at v = 0.2c. The signal reflects off the car and travels back to the police officer where he detects it. What frequency does he detect? Instead the police officer aims the radar at an airplane flying directly overhead at an altitude of 10,000 m with v=0.2c in a...
PRINTER VERSION 4 BACK NEXT ES Chapter 24, Problem 19 A lidar (laser radar) gun is...
PRINTER VERSION 4 BACK NEXT ES Chapter 24, Problem 19 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 police car uses a radar gun to measure the velocity of a car and find...
A police car uses a radar gun to measure the velocity of a car and find out if it is speeding. The most common radar gun mounted inside the squad car window or dashboard and lies in the X band frequencies of microwaves of 10.50-10.55 GHz. A handheld version of this radar gun utilizes the K band frequencies between 24.05-24.25 GHz. A handheld radar (source of waves) with a frequency of 24.13 GHz is directed to car moving at 61...
Problem 6: Radar gun A police car is at rest parallel to the highway and measures...
Problem 6: Radar gun A police car is at rest parallel to the highway and measures the speed of cars. It sends the signal with a frequency of 1200 Hz, it bounces off the moving car (it is traveling toward or away from the signal emitted) and the radar gun measures the frequency of the signal received. For one car suspected of speeding the received frequency was 1100 Hz. The speed of sound is approximately 350 m/s (note our radar...
A radar gun operates at a frequency of 10.5 GHz. A beat frequency of 2.46 GHz...
A radar gun operates at a frequency of 10.5 GHz. A beat frequency of 2.46 GHz is then observed by the radar gun when it is used on a car heading towards the radar. a) Assume a temperature of 20 degrees Celsius, calculate the velocity of the car that is driving towards the officer. Give your answer in m/s and then convert to mph. b) Assuming a temperature of 0 degrees Celsius, find velocity in terms of m/s and then...
A speeder is pulling directly away and increasing his distance from a police car that is...
A speeder is pulling directly away and increasing his distance from a police car that is moving at 24.0 m/s with respect to the ground. The radar gun in the police car emits an electromagnetic wave with a frequency of 6.95×109 Hz. The wave reflects from the speeder's car and returns to the police car, where its frequency is measured to be 316 Hz less than the emitted frequency. Calculate the speeder's speed with respect to the ground.
The radar gun of a police car emits an electromagnetic wave with a frequency of 7.5x10°Hz. The wave from the gun reflects from a speeding car and returns to the police car, where on board equipment measures its frequency to be greater than the emitted wave by 6.4 kHz. What is (1, 1,
A police officer's radar gun emits radio waves at a frequency of
11.1 GHz. What is the difference in the frequencies reflected back
to the radar gun by a car traveling at the 35 mph speed limit and a
car traveling 9 mph faster? Assume that the cars are both headed
directly away from the stationary officer.
A police officer's radar gun emits radio waves at a frequency of 11.1 GHz. What is the difference in the frequencies reflected back...
PRINTER VERSION 4 BACK NEXT ES Chapter 24, Problem 19 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...
Problem 6: Radar gun A police car is at rest parallel to the highway and measures the speed of cars. It sends the signal with a frequency of 1200 Hz, it bounces off the moving car (it is traveling toward or away from the signal emitted) and the radar gun measures the frequency of the signal received. For one car suspected of speeding the received frequency was 1100 Hz. The speed of sound is approximately 350 m/s (note our radar...
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