Discuss the evidence that supports the theory that there is a supermassive black hole at the center of our galaxy
What will be an ideal response?
There is an intense source of radio energy named Sagittarius A* at the gravitational center of the galaxy. The source has been shown to be very small—less than 1 AU in size. The source is also associated with X-Ray and infrared radiation. The connection between massive energy output and very small size is explained best by a black hole.
Stars near Sgr A* are observed to be orbiting the object at very high speeds. Using the orbital paths of these stars, the object must have a mass of approximately 4 million solar masses. This much mass could only exist in such a small volume of space as a black hole.
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What is the criterion for using lumped mass capacity?
What will be an ideal response?
The highest frequency visible light is
a. violet. b. red. c. blue. d. green. e. yellow.
Two slits are illuminated with red light (l = 650 nm). The slits are 0.25 mm apart and the distance to the screen is 1.25 m. What fraction of the maximum intensity on the screen is the intensity measured at a distance 3.0 mm from the central maximum?
a. 0.94 b. 0.92 c. 0.96 d. 0.98 e. 0.99
Which are more massive, the black holes in X-ray binaries or those at the centers of galaxies?
A: Black holes in X-ray binaries are more massive. B: Black holes in the centers of galaxies are more massive.