Sound waves propagating at 343 m/s are emitted from a vibrating jackhammer used on a maintenance site at the side of a road. A car on the road is moving toward the jackhammer at 24 m/s. The frequency of the sound waves from the jackhammer perceived by the driver of the car is 972 Hz. What is the frequency of vibration of the jackhammer? Give your answer to three significant figures.
Sound waves with a frequency of 1.86 kHz are emitted by a man shouting to a passing cyclist. The cyclist is moving at 11 m/s away from the man. The sound waves propagate at 343 m/s. What is the frequency of the sound waves from the man perceived by the cyclist? Give your answer two decimal places
A wave is emitted from a source that moves relative to a stationary observer at a velocity , where a positive value of corresponds to the motion of the source toward the observer. The wave propagates with a velocity . Which of the following formulas correctly relates the frequency , measured at the wave’s source, and the frequency of the wave measured by the observer?