A sonar echo returns to a submarine 1.50 s after being emitted. What is the distance to the object creating the echo? (Assume that the submarine is in the ocean, not in fresh water.)

A boat produces water waves as it sails along a river. You notice that 13 waves hit the bank in 5.4 seconds. If distance between successive wave crests is 3.9 centimeters, how far would these waves travel in 31 seconds. Express your answer in centimeters to at least 3 significant figures.

The electrical power needed to operate a speaker in your audio system is 18.7 W. If this speaker has a circular opening with a radius of 0.0743 m and the average sound intensity at the opening is 22.1 W/m2, determine the ratio of sound output power Psound to electrical input power Pelectrical. Psound Pelectrical

Dolphins of the open ocean are classified as Type II Odontocetes (toothed whales). These animals use ultrasonic "clicks" with a frequency of about 55 kHz to navigate and find prey.  Suppose a dolphin sends out a series of clicks that are reflected back from the bottom of the ocean 90 m below. How much time elapses before the dolphin hears the echoes of the clicks? (The speed of sound in seawater is approximately 1530 m/s.) What is the wavelength of 55 kHz sound in the ocean?

Thank you!!!

A dolphin uses echo location to track a fish in the ocean. The speed of sound in the ocean is 1470 m/sec and it takes 0.500 seconds for the sound wave to echo back to the dolphin. How far away is the fish?

An oceanic depth-sounding vessel surveys the ocean bottom with ultrasonic waves that travel 1530 m/s in seawater. How deep is the water directly below the vessel if the time delay of the echo to the ocean floor and back is  8 s?

Ultrasonic diagnostics may be used to locate a tumor in an organ such as the liver. If the speed of the wage as it travels through the liver is 6.7% less than when it is traveling through the surrounding medium, determine the depth of the tumor.

Fishing boats can be fitted with echo sounders to determine the depth of a shoal of fish below the boat. When activated, reflected waves return to the echo sounder after 0.19 s (reflected from the fish) and 0.28 s (reflected from the ocean floor). If the speed of sound in seawater is 1490 m/s, determine the distance between the ocean floor and the shoal of fish.

A bat flying at 10.0 m/s is chasing an insect flying in the same direction.  The bat emits a 40.0 kHz chirp and receives back an echo at 40.2 kHz.  How can you tell that the bat will catch the insect without performing any calculations?