A bat, flying at 4.8 m/s, pursues an insect that is flying at 1.1 m/s in the same direction. The bat emits a 42000-Hz sonar pulse. Take the speed of sound to be 343 m/s. At what frequency, in hertz, does the bat hear the pulse reflected back from the insect?

Problem 6: A bat, flying at 4.9 m/s, pursues an insect that is flying at 1.4 m/s in the same direction. The bat emits a 49000-Hz sonar pulse. Take the speed of sound to be 343 m/s. At what frequency, in hertz, does the bat hear the pulse reflected back from the insect? Numeric : Anumeric value is expected and not an expression. f =.

A sound has an intensity of 150 W/m2 at a distance of 8.50 m from the source. What is the power of the wave at its source? At what distance will its intensity drop to 1W/m2?

A bat traveling at a speed of 18.1 m/s sends out sound at a frequency of 48.2 kHz, can 'see' objects due to echolocation. What frequency would the bat hear returning from a stationary wall in front of it? (assume the speed of sound in air is 343 m/s)