finala

# finala - Exam Name MULTIPLE CHOICE Choose the one...

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Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) You pour 100g of water at 80 degree Celsius into the ocean, which is at 20 degree Celsius, and wait about 10 minutes. Is this process reversible? Calculate the net entropy change during this process. A) reversible; 10 J/K B) reversible; 100 J/K C) irreversible; 1 J/K D) irreversible; 10 J/K E) irreversible; 100 J/K 1) 2) The sound source of a ship's sonar system operate at a frequency of 22kHz. The speed of sound in water is 1482 m/s. A whale is traveling straight toward's the ship's sonar at a speed of 4.95 m/s. The ship is at rest in the water. What's the difference in frequency between the sound the sent by the ship's sonar system, and the sound received by the ship's sonar system after reflection off the whale? A) 75 Hz B) 150 Hz C) 300 Hz D) 600 Hz E) 1200 Hz 2) 3) Three polarizing filters are stacked with the polarizing axes of the second and third at 45 and 90 degrees, respectively, with that of the first. Unpolarized light has intensity of 75 W per square cm after it pases through all three polarizers. What's the initial intensity of the light? A) 75W B) 150W C) 300W D) 600W E) 1200W 3) 4) We are comparing a mono-atomic with a di-atomic gas at a temperature slightly higher than what's needed to excite vibrational degrees of freedom in the gas. Which of the following statements is most accurate? A) Both gases have the same average internal energy per molecule. B) The average internal energy per molecule for the di-atomic gas is a factor 5/3 larger than that for the mono-atomic gas. C) The average internal energy per molecule for the di-atomic gas is a factor 7/3 larger than that for the mono-atomic gas. D) The average internal energy per molecule for the di-atomic gas is a factor 7/5 larger than that for the mono-atomic gas. E) The average internal energy per molecule for the di-atomic gas is smaller than that for the

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finala - Exam Name MULTIPLE CHOICE Choose the one...

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