The Doppler shift is used to find
A) astrometric binaries.
B) spectroscopic binaries.
C) photometric binaries.
D) visual binaries.
E) eclipsing binaries.
B
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a. True b. False Indicate whether the statement is true or false
Which of the following spectral types is more likely to be a flare star?
A) KIII B) MV C) GV D) I E) BII
Why are Kepler's Laws of Planetary Motion a success story for the scientific method?
A current element (length = 1.0 cm) lies along the x axis with its center at x = 0 and carries a 20-A current in the positive x direction. Consider only the field of this current element and decide which combination of the following statements is correct. 1. The field at (0, 0, 1.0 m) is in the positive z direction. 2. The field at (0, 1.0 m, 0) is in the negative y direction. 3. The field at
(1.0 m, 0, 0) is zero. 4. The field at (0, 0, 1.0 m) is in the negative y direction. a. 3 and 4 b. 1 and 3 c. 2 and 4 d. 1 and 2 e. None of these