This figure shows an all-sky map of the cosmic microwave background recorded by the Planck mission. What do the dark and bright variations represent?
A) regions of the sky with very slightly different density at the time the radiation was emitted
B) regions of the sky with different proportions of hydrogen and helium at the time the radiation was emitted
C) the present distribution of galaxies in the universe
D) regions of the sky with different amounts of dark energy
A) regions of the sky with very slightly different density at the time the radiation was emitted
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According to the ______ theory social interaction extends life long selection processes. Physical and psychological aspects of aging leads to changes in the functions of social interaction.
Fill in the blank(s) with the appropriate word(s).
_____ is the energy believed to fill empty spaces and drive the acceleration of the expanding Universe
A) Kinetic energy B) Hot energy C) Dark energy D) Light energy
Which of the following statements is true of green grass?
A) It absorbs red light and reflects green light. B) It absorbs red light and emits green light. C) It transmits all colors of light except green. D) It means the lawn is healthy.
A straight wire of length L carries a current I in the positive z direction in a region where the magnetic field is uniform and specified by Bx = 3B, By = ?2B, and Bz = B, where B is a constant. What is the magnitude of the magnetic force on the wire?
a. 3.2 ILB b. 5.0 ILB c. 4.2 ILB d. 3.6 ILB e. 1.0 ILB