What effect does the formation of sea ice in polar regions have on the density of seawater?
What will be an ideal response?
Answer: When seawater in polar regions freezes only the water freezes, the salt is left behind. The surrounding seawater experiences an increase in salinity, which brings an increase in density. The cold, denser, saltier seawater sinks, producing a pattern of vertical movement. Movement is also horizontal as cold dense water flows along the bottom to the deeper parts of the ocean floor.
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At the Earth's surface, approximately 1000 W/m2 is present due to solar radiation. At a latitude of 44.5 degrees North, the angle of the sun’s rays, when the sun is highest in the sky on the winter solstice, are incident at an angle of 68 degrees from the vertical. What power is incident upon a 1.0 m x 1.5 m window in a vertical, south-facing wall at this time?
A. 1390 W B. 930 W C. 560 W D. 370 W
Nuclear Fission and Fusion: When 235U undergoes fission, the average energy per fission event is 200 MeV. How much energy is released in the total fission of 2.0 g of 235U? (1 eV = 1.60 × 10-19 J, mneutron ? mproton = 1.67 × 10-27 kg)
A. 1.6 × 1011 J B. 3.9 × 1013 J C. 1.6 × 105 J D. 3.9 × 1010 J
A spaceship carrying a light clock moves at a speed of 0.96 c relative to an observer on Earth. Relative to a frame of reference that is fixed with respect to the earth, how long does it take the clock to advance 1 s?
A) 5.83 s B) 3.57 s C) 0.96 s D) 1.22 s E) 2.59 s
What is the wavelength of the emitted photon if an electron in the hydrogen atom makes a transition from the ni = 2 to the nf = 1 state?
A) 205.2 nm B) 87.5 nm C) 91.2 nm D) 121.5 nm E) 402.1 nm