A police car on the side of the road (at rest) uses a radar gun to...

A police car on the side of the road (at rest) uses a radar gun to catch speeders as they approach it. The frequency the radar gun emits is 8 x 109 Hz and the speed limit is 65 mi/hr.

a)What is the frequency of the radio wave that the car "sees"? Since they cant really see:)

b)What is the frequency of the reflected radio wave that is picked up by the receiver inside the radar gun?

Solutions

Expert Solution

genius_generous answered 1 year ago

Next > < Previous

Related Solutions

A police car is located 70 feet to the side of a straight road. A red...

A police car is located 70 feet to the side of a straight road. A red car is driving along the road in the direction of the police car and is 140 feet up the road from the location of the police car. The police radar reads that the distance between the police car and the red car is decreasing at a rate of 70 feet per second. How fast is the red car actually traveling along the road? The...

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 60 km/h, another man's car is approaching the police car, from left to right, at a speed of 130 km/h. A police-powered radar gun emits an electromagnetic wave whose frequency is 8 x 10^9 Hz that is reflected from the oncoming car. a) What is the difference between the frequency of the wave emitted by the gun and...

Digital Controls, Inc. (DCI), manufactures two models of a radar gun used by police to monitor...

Digital Controls, Inc. (DCI), manufactures two models of a radar gun used by police to monitor the speed of automobiles. Model A has an accuracy of plus or minus 1 mile per hour, whereas the smaller model B has an accuracy of plus or minus 3 miles per hour. For the next week, the company has orders for 100 units of model A and 150 units of model B. Although DCI purchases all the electronic components used in both models,...

Problem 3 Police car is chasing a speed limit violator car with a Doppler radar installed...

Problem 3 Police car is chasing a speed limit violator car with a Doppler radar installed on the roof. Suppose the speed of sound is 300 m/s. When the police car has a velocity v = 10 m/s in the lab frame, it sends a 30 kHz frequency signal. 3.1 If the violator is moving at 20 m/s, what would be the frequency of the radar signal if received by an instrument installed at the violator car? 3.2 If the...

When the police want to know how fast your car is going, they shoot a "radar...

When the police want to know how fast your car is going, they shoot a "radar gun" at the car. The radar gun emits waves at approximately 24.15 GHz. Those waves reflect off of your car and are detected by the same "radar gun" that emitted them. The detector can detect both frequency and intensity. Using concepts of general physics, explain how the radar gun works. You probably want to draw pictures, use an equation or two, and use words.

A person is driving his car on some road and suddenly a police car stops him...

A person is driving his car on some road and suddenly a police car stops him for speeding, the police-detected radar gun emits a wave whose frequency is 8.0 × 109 ??. 1. How do you think the mechanism by which you know how fast a moving car can go works? 2. Does it depend on the speed of the police car? Does it depend on the speed of the person's car? 3. Does it depend on the two speeds?...

1a) Using radar, the police measured a 2670-lb car going 85.5 mph. Suppose that at the...

1a) Using radar, the police measured a 2670-lb car going 85.5 mph. Suppose that at the moment of the measurement the car\'s position was known to within 5.0 feet, what would the uncertainty be of the car\'s velocity? Again use the form of the uncertainty principle that has ≥ h / (4π ) 1b) If the car was in a 75 mph speed zone, could they get out the speeding ticket by using the uncertainty principle?

Two used car dealerships compete side by side on a main road. The first, Harry’s Cars,...

Two used car dealerships compete side by side on a main road. The first, Harry’s Cars, always sells high-quality cars that it carefully inspects and, if necessary, services. On average, it costs Harry’s $8000 to buy and service each car that it sells. The second dealership, Lew’s Motors, always sells lower-quality cars. On average, it costs Lew’s only $5000 for each car that it sells. If consumers knew the quality of the used cars they were buying, they would pay...

A motorist is targeted by police radar when approaching a traffic control post. The radar emits...

A motorist is targeted by police radar when approaching a traffic control post. The radar emits at the frequency f=2.5 x 109 Hz and receives the reflected wave at a frequency of 250 Hz higher. Calculate the speed of the car. Determine the expression of the wave equations for the electric and magnetic fields emitted by the radar. The average intensity is 40 W/m2. The wave propagates in the direction of Y>0. The electric field of the wave is maximum...

A state highway patrol car radar unit uses a frequency of 9.00×109 Hz . What frequency...

A state highway patrol car radar unit uses a frequency of 9.00×109 Hz . What frequency difference will the unit detect from a car receding at a speed of 66.5 m/s from a stationary patrol car?

Subjects