Plzzz help!! A stationary speed gun emits a microwave beam at 2.10x1010 Hz. It
reflects off a car and returns 1030 Hz
higher. What is the speed of the car?
(Unit = m/s)

The speed of the car is 14.7m/second or 15 m/second approximately.

Explanation:

A microwave beam at is generated by a stationary speed gun. It bounces off a car and returns at a higher frequency of 1030 Hz. The car's observed frequency would be the product of adding the two frequencies. That is to say,

       F = =

Using doppler effect formula

Where

F = observed frequency

f = source frequency

C = speed of light =

V = speed of the car

 Putting the values in the formula -

by cross multiplication ,

   300000014.7 - 1.000000049V =

    Collect the like terms  

1.000000049V = 14.71429

      Make V the subject of formula

V =

V = 14.7 m/s

Therefore , the speed of the car is 15m/second approximately.

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