A bus standing at a bus stand blows a horn 300 Hz in still air. The speed of sound in still air = 340 m/s. Determine : (i) the frequency of the horn heard by a man running away fro the bus at 8 m/s and speed of sound in this case. (ii) wavelength of sound received by the man.
A sentence has been given in Direct/Indirect Speech. Out of the four given alternatives, select the one which best expresses the same sentence in Indirect/Direct Speech. “Run away, children,” said their uncle.
A player kicks a football obliquely at a speed of 20 m//s so that its range is maximum. Another player at a distance of 24m away in the direction of kick starts running at that instant to catch it, the speed with which the second player has to run is (g=10 ms^(-2))
A train stands at a platform blowing a whistle of frequency 400Hz in still air. What is the frequency of the whistle heard by a man running (a) towards the engine at 10ms^(-1) (b) away from the engine at 10m//s ? What is the wavelength of sound received by the running man in each case ?
A person runs with a speed u towards a bicycle moving away from him with speed v . The person approaches his image in the mirror fixed at the rear of bicycle with a speed of
