Problems An engineer at an underwater military station listens for submarines by sending an ultrasound sonar ping that has a frequency of 3.75 MHz.
{"Image DocumentName": "ProblemsAn engineer at an underwater military station listens for submarines by sending an ultrasound sonar ping that has a frequency of 3.75 MHz.", "Image ImageDescription": "a. A stationary object is detected when the ping returns 3.00 s later. How far away is this object? The speed of sound in seawater is 1533 m/s. b. A second ping returns with a frequency of 3.80 MHz, indicating that the object is now moving. What is the object\u2019s velocity? In which direction is it moving relative to the listening station? Hint: The direction of sound reverses after the sound reflects off the moving object. c. Sonar equipment has difficulty detecting objects smaller than the wavelength of the ping. Old sonar equipment used an audible ping with a frequency of 4.00\u00b4102 Hz. What is the smallest object this old sonar could distinguish? d. What is the smallest object the ultrasound sonar can detect?", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}