If a metal contains 1028 free electrons, the number of different quantum states (nx, ny, and nz) is equal to:
(a) 1028
(b) 2×1028
(c) 0.5×1028
(d) 1
(c) 0.5×1028
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Twenty milliseconds is 0.020 s
a. True b. False Indicate whether the statement is true or false
This image shows a colliding pair of galaxy clusters known together as the Bullet Cluster. The blue region represents a map of the cluster's dark matter. How was this blue map made?
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A double-convex thin lens has radii of curvature of magnitude 46 cm, and it is made of glass of index of refraction 1.60. What is the focal length of this lens?
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