Question

A police motor cycle running at 140km/hr sounds a siren of 10 kHz frequency while
chasing a car at 150Km/hr. The apparent frequency heard by the car driver is?

Answer 1

Answer:

Explanation:

PLS FIND THE ATTACHMENT

Answer 2

Answer:

The apparent frequency heard by the car driver is 15.11 kHz.

Explanation:

Given,

The velocity of the motorcycle (source) is (v) = 140 km/hr.

The velocity of the car (observer) is (u) = 150 km/hr.

The velocity of the sound in air is (V) = 340 km/hr

The actual frequency of sound emitted (f) = 10 KHz

To find,

The apparent frequency heard by the car driver (f')

Calculation,

We know that:

$f_0= \frac{V + v_0}{V + v_s} f_s$

Where $f_0$ = observer frequency of sound

           V = speed of sound waves

           $v_0$ = observer velocity

            $v_s$ = source velocity

             $f_s$ = actual frequency of sound waves

Now by substituting the values:

$f' = \frac{V + u}{V + v} f$

f' = (1188 + 150)/(1188 + 140) (15 kHz)

f' = 15.11 kHz

Therefore, the apparent frequency heard by the car driver is 15.11 kHz.

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