A train moves towards a stationary observer with a speed \( 34 \mathrm{~m} / \mathrm{s} \). The ...

Channel:
PW Solutions
Subscribers:
453,000
Published on ● Video Link: https://www.youtube.com/watch?v=iYJLBFCBNik


Duration: 3:20
63 views
2

A train moves towards a stationary observer with a speed \( 34 \mathrm{~m} / \mathrm{s} \). The train sounds a whistle and its
P frequency registered by the observer is \( f_{1} \). If the

W. speed of the train is reduced to \( 17 \mathrm{~m} / \mathrm{s} \), the frequency registered is \( f_{2} \). If the speed of sound is \( 340 \mathrm{~m} / \mathrm{s} \) then the ratio \( \frac{f_{1}}{f_{2}} \) is
(1) \( \frac{18}{19} \)
(2) \( \frac{1}{2} \)
(3) 2
(4) \( \frac{19}{18} \)
📲PW App Link - https://bit.ly/YTAI_PWAP
🌐PW Website - https://www.pw.live



Other Videos By PW Solutions


2022-12-02Define the intensity of electromagnetic wave? Write its formula in terms of r.m.s. value of elec...
2022-12-02Three charged particles having charges \( q,-2 q \& q \) are placed in a line at points \( (-a, ...
2022-12-02Ten tuning forks are arranged in increasing order of frequency in such a way that any two consec...
2022-12-02Three point charges \( q, q \&,-2 q \) are placed at the corners of an equilateral triangle of s...
2022-12-02Which of the following is not true about electric charge? W (1) Charge on a body is always integ...
2022-12-02If a point charge \( q \) is placed at the centre of a cube what is the flux linked with the cub...
2022-12-02A particle of mass \( 100 \mathrm{gm} \) and charge \( 2 \mu \mathrm{C} \) is released from a di...
2022-12-02Two plane sheets of charge having charge densities \( \sigma_{1} \) and \( \sigma_{2} \) are nor...
2022-12-02A tuning fork of unknown frequency produces P 4 beats per second when sounded with another W. t...
2022-12-02The pressure and volume of a gas are changed as shown in the \( P-V \) diagram in this figure. T...
2022-12-02A train moves towards a stationary observer with a speed \( 34 \mathrm{~m} / \mathrm{s} \). The ...
2022-12-02Figure shows the position-time graph of an object in SHM. The correct equation representing this...
2022-12-02दो प्रतिरोगणुण पदाधों के नाम लिखिए।
2022-12-02An electric dipole of dipole moment \( P \) is placed in a uniform electric field \( E \) is sta...
2022-12-02A particle execute SHM along a straight line. The amplitude of oscillation is \( 2 \mathrm{~cm} ...
2022-12-02A sample of an ideal gas undergoes an isothermal expansion. If \( d Q, d U \) and \( d W \) repr...
2022-12-02Which of the following \( P-V \) curve best represents an isothermal process? (1) (2) P W (3) (4)
2022-12-02The water in a reservoir is \( 25 \mathrm{~m} \) deep. A horizontal pipe \( 5 \mathrm{~cm} \) in...
2022-12-02A charge \( Q \) is distributed over two concentric hollow spheres of radii \( r \) and \( \math...
2022-12-02A parallel-plate air capacitor has a plate area of \( 100 \mathrm{~cm}^{3} \) and separation \( ...
2022-12-02A simple pendulum consists of a small sphere of mass \( m \) \( \mathrm{P} \) suspended by a thr...


Tags:
pw