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Integrated ConceptsPolice radar determines the speed of motor vehicles using the same Doppler-shift technique employed for ultrasound in medical diagnostics. Beats are produced by mixing the double Doppler-shifted echo with the original frequency. If $1.50 \times 10^{9}-$ Hz microwaves are used and a beat frequency of 150 $\mathrm{Hz}$ is produced, what is the speed of the vehicle? (Assume the same Doppler-shift formulas are valid with the speed of sound replaced by the speed of light.)

$$3 m / s$$

Physics 102 Electricity and Magnetism

Chapter 24

Electromagnetic Waves

Cornell University

Simon Fraser University

Hope College

McMaster University

Lectures

03:40

In physics, electromagneti…

10:59

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04:55

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05:11

09:01

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01:31

A police car's radar …

00:42

The Doppler shift for a Do…

06:46

A lidar (laser radar) gun …

05:02

$\bullet$ A state highway …

02:50

02:36

Many police departments us…

02:13

A state trooper chases a s…

01:34

05:14

$\cdots \bullet$ Predict/C…

03:14

The Doppler effect using u…

07:38

(III) The Doppler effect u…

02:30

(II) In one of the origina…

05:05

04:45

A Doppler speed meter oper…

05:27

Multiple-Concept Example 6…

03:10

In one of the original Dop…

03:09

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Hello, France. This is the problem Based on Doppler effect on formation off, it's due to superposition off to electromagnetic waves as we know the APR in frequency. Anger original frequency are related as according toe Doppler effect f is going toe have not we plus B not upon the here we not is well a city off observer on V is the velocity off light the average frequency. It's superimposing two original frequency to produce the beach off frequency 1 50 hertz So a print frequency will be Have not bless beat frequency. Original frequency is given 1.5 into 10 to the power light and beat frequency is given 1 50 So a print frequency you will get 15 00 zero one plate hurts hence from equation but F 15000 one fight. It's called 15 in tow. 10 to the power nine three into 10 to the power eight plus we not upon three into 10 to the power eight. So on solving speed off the river we will get 3 m per second. That's all. Thanks for watching it

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