Two trains A and B are moving with speeds 20 m/s and 30 m/s respectively in the same…
Physics · JEE Advanced · NTA Exams — Kinematics
Two trains A and B are moving with speeds 20 m/s and
30 m/s respectively in the same direction on the same straight track, with B ahead of A. The engines are at the front ends. The engine of train A blows a long whistle. Assume that the sound of the whistle is composed of components varying in frequency from f1 = 800 Hz to f2 = 1120 Hz, as shown in the figure. The spread in the frequency (highest frequency – lowest frequency) is thus 320 Hz. The speed of sound in still air is 340 m/s.
The spread of frequency as observed by the passengers in train B is
- 310 Hz
- 330 Hz
- 350 Hz
- 290 Hz.
Answer
(A) 310 Hz
Sign up free on Edukali to view the step-by-step worked solution and practice thousands of similar questions.
Related practice questions
- A car is moving on a straight road. The velocity of the car varies with time as shown in the figure…
- Two particles A and B are projected simultaneously from a point situated on a horizontal plane. The particle…
- The displacement–time graph of a moving particle is shown in figure. The instantaneous velocity of the…
- A small block is shot into each of the four tracks as shown below. Each of the tracks rises to the same…
- A projectile is thrown in the upward direction making an angle of 60^ with the horizontal direction with a…
- A stone is released from a high-flying balloon that is descending at a constant speed of 10 m/s. After 20 s…
- When a ball is thrown up vertically with velocity V 0 , it reaches a maximum height of ‘h’. If one wishes to…
- An elevator is moving upwards with constant acceleration. The broken curve shows the position y of the…