Tonight, your telescope shows you RXJ1800, a galaxy, very near in the sky to the bright star Vega. What can you conclude from this observation?

A) Vega and RXJ1800 must be very close to each other, less than a few light years.
B) RXJ1800 and Vega will drift apart from each other on the sky, over a matter of nights.
C) Vega orbits the center of mass of RXJ1800.
D) RXJ1800 and Vega will set in the west, at very similar times.

D

Physics & Space Science

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Some elements like iron, cobalt, and holmium make very good natural magnets. Which of the following statements best describes why?

a.Selection rules for multi-electron atoms tend to maximize electron spin and orbital angular momentum. b.Atoms in the crystalline structure of the solid metal tend to antialign their spin and orbital angular momentum. c.Large numbers of paired electron spins are essential to good magnets. d.The filled s shells with high n and paired electrons create larger atomic radii and therefore the electrons can contribute more to the magnetic field.

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Polarization: Unpolarized light of intensity I0 passes through four ideal polarizing sheets. The polarizing angle of each sheet is rotated 30° from the one before it, so that the last sheet is aligned at 90° to the first sheet. What is the intensity of the light emerging from the fourth sheet in terms of I0?

Fill in the blank(s) with the appropriate word(s).

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The scarps on Mercury are extremely similar to the cratered lunar highlands in appearance

Indicate whether the statement is true or false

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Exclusion Principle: Which of the following values can be taken by the electron spin quantum number, ms?

A. ±1/2 B. 0 C. ±1 D. ±2 E. ±3

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