The diagram below shows the radial velocity curve of a double-line spectroscopic binary. Based on this radial velocity curve, which of the following statements is correct?
a. Star A is twice the mass of star B.
b. Star B is twice the mass of star A.
c. Star A is ten times the mass of star B.
d. Star B is ten times the mass of star A.
e. Star A and Star B have the same mass.
B
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Most of the hot, young blue stars lie in the ________ of our Galaxy
A) bulge B) globular clusters C) central bar D) spiral arms E) halo
For normal vision, an object can be seen clearly when it is beyond the ______________
Fill in the blank(s) with correct word
X-rays of wavelength 0.20 nm are scattered by a free electron
the change in the wavelength of the x-rays is observed to be 2.0 × 10-12 m at a certain scattering angle measured relative to the incoming x-ray direction. What is the scattering angle of the x-rays? (melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s) A) 60° B) 80° C) 20° D) 40°
You stand on a bathroom scale at the equator and at the north pole. The scale reading at the equator is _______________ the scale reading at the north pole
Fill in the blank(s) with correct word