Dolphins of the open ocean are classified as type ii odontocetes (toothed whales). these animals use ultrasonic "clicks" with a frequency of about 55.3 khz to navigate and find prey.
(a) suppose a dolphin sends out a series of high-pitched clicks that are reflected back from the bottom of the ocean 86 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.)
answer in seconds
(b) what is the wavelength of 55.3 khz sound in the ocean?
answer in mm

Part a)

Part b)

Explanation:

Part a)

As we know that the sound will go to the bottom of the sea and then come back to the dolphin

so here total distance moved by the whale is given as

Part b)

As we know that frequency and wavelength are related to the speed of the wave as

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach