Question: Police use radar guns and the Doppler effect to catch speeders. The figure illustrates a moving car approaching a stationary police car. A radar gun

Police use radar guns and the Doppler effect to catch speeders. The figure illustrates a moving car approaching a stationary police car. 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. One such radar gun emits a wave whose frequency is 8.0 × 10⁹ Hz. When the speed of the car is 39 m/s and the approach is essentially head-on, what is the difference between the frequency of the wave returning to the police car and that emitted by the radar gun?

Step by Step Solution

★★★★★

3.33 Rating (168 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

REASONING As the car moves toward the wave emitted by the radar gun the car intercepts a greater number of wave crests per second than it would if it ... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Students Have Also Explored These Related Physics 11th edition Questions!

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...

The police department of Youbet, Michigan, is considering the purchase of new radar guns. On the average, the guns presently used by the department can detect a speeding vehicle at a distance of 2217...

On a particularly busy section of the Garden State Parkway in New Jersey, police use radar guns to detect speeders. Assume the time that elapses between successive speeders is exponentially...

Chirp chirp! 1 point possible (ungraded) Consider an idealized bird (treated as a point source) that emits constant power. If you double your distance from the bird, by how much does the sound level...

Police RADAR speed detectors bounce microwave light radiation off of moving vehicles and detect the reflected waves. These waves are shifted in frequency by the Doppler effect, and the frequency...

4 1. 1. A car drives by at 20mph, with a violinist in it playing a song. The speed of sound is 343 m/s. The violin is actually playing at 800Hz, what frequency do you hear before and after the car...

On a particularly busy section o f the Garden State Parkway in New Jersey, police use radar guns to detect speeders. Assume the tim e that elapses between successive speeders is exponentially...

Answer the questions...no need detail explanation Question 1 On a particular busy street of Petra Jaya in Kuching, police use radar guns to detect speeding drivers. Assume the time that elapses...

on a particular busy section of the garden state parkway in New Jersey police use radar guns to detect speeding drivers assume the time that lapses between successive speeders is exponentially...

On a particularly busy section of the Garden State Parkway in New Jersey, police use radar guns to detect speeders. Assume the time that elapses between successive speeders is exponentially...

Tasman Teleco Ltd has two divisions and operates out of Auckland, New Zealand. The Express Division manufactures and transfers a range of computer circuit boards to the Harris Division, which uses...

Write a reflective paper about Disability Network West Michigan

21. In Table 10.18, which option correctly shows a species which is reduced and a species which is in the blast furnace? Reduced Oxidised A carbon monoxide carbon dioxide B carbon dioxide calcium...

3. Describe the Federal Open Market Com mittee. How many voting members are on this committee? How often does a mem ber of the Board of Governors get to vote on the FOMC? How often do the presi dents...

Two vectors are given by d = (4.0 m)i (3.0 m)j + (1.0m)k and b = ( 1.0 m)i + (1.0 m)j + (4.0 m)k. In unit-vector notation, find (a) d + b, (b) a b, and (c) a third vector c such that a - b + c = 0.

Find the (a) x, (b) y, and (c) z components of the sum r of e displacements c and d whose components in meters along the three axes are cx = 7.4, cy = 3.8, cz = 6.1, dx = 4.4, d, = 2.0, dz = 3.3.

An ant, crazed by the Sun on a hot Texas afternoon, darts over an xy plane scratched in the dirt. The x and y components of four consecutive darts are the following, all in centimeters: (30.0, 40.0),...

Suppose you can invest in fund R&R (named after Risk and Return), which manages a portfolio with an expected return of 15% and a standard deviation of 20%. At the same time, the T-bill rate is 8%....

Q4 Question 4 (10 marks) a) What is the effective annual cost of credit terms of 1/10 net 30, if the firm stretches the account payable to 40 days? (2 marks) b) Bercraft Ltd has an average accounts...

Suppose a ten-year, $1,000 bond with an 8% coupon rate and semi-annual coupons is trading for $1,034.74 A. What is the bond's yield to maturity(expressed an APR with semi-annual compounding)? B. If...