5. 3.33 points SerCP10 14 P004. My Notes Ask Your Teac A dolphin located in sea

Question

5. 3.33 points SerCP10 14 P004. My Notes Ask Your Teac A dolphin located in sea water at a temperature of 25°C emits a sound directed toward the bottom of the ocean 310 m below. How much time passes before it hears an echo? Submit Answer Save Progress -13.33 points SerCP10 15 P006 )My Notes Ask Your A molecule of DNA (deoxyribonucleic acid) is 2.21 m Iong. The ends of the molecule become singly ionized: negative on one end. positive on the other. The helical molecule acts like a spring and compresses 1.34% upon becoming charged. Determine the effective spring constant of the molecule. N/m

Explanation / Answer

Speed of sound in seawater at 25 degree Celsius = 1530 m/s

Distance to be covered = 2h = 2*310 = 620 m

Time gap = distance /speed

= 620/1530 = 0.405 s answer

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