A train is moving with a uniform speed of 33 m / s and an observer is approaching the train with the same speed. If the t in blows a whistle of frequency 1000 H z and the velocity of sound is 333 m / s, then the apparent frequency of the sound that the observer hears is

Question

A train is moving with a uniform speed of 33 m / s and an observer is approaching the train with the same speed. If the t in blows a whistle of frequency 1000 H z and the velocity of sound is 333 m / s, then the apparent frequency of the sound that the observer hears is (A) 1220 Hz (B) 1099 Hz (C) 1110 Hz (D) 1200 Hz

Tardigrade Admin · Accepted Answer

We have, Apparent frequency, v =((v+u0/v-us)) v0=((333+33/333-33)) × 1000 =(366/300) × 1000=1220 Hz

Q. A train is moving with a uniform speed of $33 m / s$ and an observer is approaching the train with the same speed. If the t in blows a whistle of frequency $1000 Hz$ and the velocity of sound is $333 m / s$ , then the apparent frequency of the sound that the observer hears is

1220 Hz

1099 Hz

1110 Hz

1200 Hz

We have,
Apparent frequency,
$v = (\frac{v + u _{0}}{v - u _{s}}) v_{0} = (\frac{333 + 33}{333 - 33}) \times 1000$
$= \frac{366}{300} \times 1000 = 1220 Hz$

Q. A train is moving with a uniform speed of 33m/s and an observer is approaching the train with the same speed. If the t in blows a whistle of frequency 1000Hz and the velocity of sound is 333m/s, then the apparent frequency of the sound that the observer hears is