A dolphin located in sea water at a temperature of 26◦C emits a sound directed toward the bottom of the ocean 136 m below. How much time (in seconds) passes before it hears an echo? Assume the the speed of sound in sea water is 1530 m/s at this temperature.

Idon’t quite understand this problem

Calculate the ratio of h+ ions to oh– ions at a ph = 6. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 6. are they the same? why or why not? record your explanation in table a. what is the concentration of h+ ions at a ph = 6? mol/l what is the concentration of oh– ions at a ph = 6? mol/l what is the ratio of h+ ions to oh– ions at a ph = 6? : 1

How does an observation about an object differ from an inference about that object