What is the purpose of a "star shade" in efforts to directly detect extrasolar planets?
A) The star shade blocks light from the central star, so planets can be seen.
B) The star shade cools the star, so it does not emit so much contaminating light.
C) The star shade keeps the telescope cooler, so it does not emit as much infrared light.
D) The star shade changes the wavelength of starlight, so it is easier to distinguish from planet light.
E) The star shade separates starlight from planet light based on temperature.
A) The star shade blocks light from the central star, so planets can be seen.
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Exclusion Principle: According to the quantum mechanical model of the hydrogen atom, if the principal quantum number is n, how many different orbital angular momentum quantum numbers are permitted?
A. n/2 B. n C. 2n D. 3n E. 4n
You and Mae are in free-float frames. Mae has just passed you, traveling at a speed of 60 km/hr. You throw a ball toward her at a speed of 60 km/hr. What will Mae see the ball doing?
A) She'll see the ball stationary, floating freely in her own reference frame. B) She'll see the ball coming toward her at 60 km/hr. C) She'll see the ball moving away from her at 60 km/hr. D) She'll see the ball coming toward her at 120 km/hr.
A particle with a half-integral spin is a
a. boson. b. lepton. c. fermion. d. hadron. e. muon.
A 2.00-qt bottle of soda is on sale for $1.29. What should be the price of a 2.00-L bottle of the same soda to yield the same value? (1.00 qt = 0.947 L)
What will be an ideal response?