The magnification M = -di/do is the ratio of image to object
A) angular size.
B) distance.
C) focal distances.
D) heights.
B
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According to the Big Bang theory, how many forces, and which ones, operated in the universe during the GUT era?
A) two forces: gravity and a single force that later became the strong, weak, and electromagnetic forces B) one force that represented the unification of all four forces that operate today C) three forces: gravity, the strong force, and the electroweak force D) two forces: the strong force and the electroweak force
If an atom emits a photon, that photon must have a wavelength ________.
A. that corresponds to the energy difference between two orbitals B. as long as the distance between two orbitals C. shorter than the absorbed photon that caused the emission D. that corresponds to the lowest energy level of that atom E. that corresponds to twice the energy difference between two orbitals
A sphere is constructed of two concentric parts. The inner part is a solid sphere of radius 10.0 cm made of a material with density 4000 kg/m3
The outer part is a spherical shell with inner radius 10.0 cm and outer radius 20.0 cm. The material in the outer shell has a density 9000 kg/m3. (a) What is the mass of the sphere? (b) What is the average density of this sphere? What will be an ideal response?
We now recognize that the largest Kuiper Belt Object could be ________, discovered almost a century ago
Fill in the blank(s) with correct word