What is the best evidence for an extremely massive black hole in the center of the Milky Way?
A) The orbits of stars in the center of the galaxy indicate that the presence of an approximately 4 million solar-mass object in a region no larger than our solar system.
B) Huge amounts of x-rays are pouring out of the center of the galaxy.
C) The center of our galaxy hosts a pulsar that is spinning so fast that it could only be a black hole.
D) We observe stars vanishing in the center of the Galaxy as they are sucked into the black hole.
A) The orbits of stars in the center of the galaxy indicate that the presence of an approximately 4 million solar-mass object in a region no larger than our solar system.
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A researcher is using x-rays to investigating a cubic crystal. He is looking at Bragg reflection from the planes parallel to the cube faces
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According to the philosophical ideas associated with quantum theory,
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3.00 moles of an ideal gas at a pressure of 250 kPa are held in a container of volume of 25.0 L. The ideal gas constant is R = 8.314 J/mol ? K = 0.0821 L ? atm/mol ? K, and 1 atm = 1.01 × 105 Pa. The temperature of this gas is closest to
A) 240°C. B) -180°C. C) 480°C. D) -1.0°C. E) -22°C.