A train blowing a whistle of frequency 320 Hz approaches an observer standing on the platform at a speed of 66 m / s. The frequency observed by the observer will be (given speed of sound =330 ms -1 ) Hz,

Question

A train blowing a whistle of frequency 320 Hz approaches an observer standing on the platform at a speed of 66 m / s. The frequency observed by the observer will be (given speed of sound =330 ms -1 ) Hz, (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

<img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/physics/df878adb7a7969d4aa5e83aeb730538f-.png" /> f text app =f((v/v-vs)) =320((330/330-66)) =400 Hz

Q. A train blowing a whistle of frequency $320 Hz$ approaches an observer standing on the platform at a speed of $66 m / s$ . The frequency observed by the observer will be (given speed of sound $= 330 m s^{- 1}$ ) ____ $Hz$ ,

$f_{app} = f (\frac{v}{v - v _{s}})$
$= 320 (\frac{330}{330 - 66})$
$= 400 Hz$

Q. A train blowing a whistle of frequency 320Hz approaches an observer standing on the platform at a speed of 66m/s. The frequency observed by the observer will be (given speed of sound =330ms−1 ) ____Hz,

fapp ​=f(v−vs​v​) =320(330−66330​) =400Hz

Q. A train blowing a whistle of frequency $320 Hz$ approaches an observer standing on the platform at a speed of $66 m / s$ . The frequency observed by the observer will be (given speed of sound $= 330 m s^{- 1}$ ) ____ $Hz$ ,

$f_{app} = f (\frac{v}{v - v _{s}})$
$= 320 (\frac{330}{330 - 66})$
$= 400 Hz$