Two pairs of sunspots appear similar, but if one was observed in 1990, and the next in 2002, we would note what difference?
What will be an ideal response?
In the 12 years, the magnetic field polarities will have reversed.
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How can an electron in an atom lose energy to go from a higher energy level to a lower energy level?
A) It absorbs a photon equal in energy to its own energy drop. B) It loses kinetic energy. C) It loses gravitational potential energy. D) It releases a photon equal in energy to its own energy drop. E) It exchanges gravitational potential energy for kinetic energy.
A Christmas ornament made from a thin hollow glass sphere hangs from a small hook at its surface. It is observed to oscillate with a frequency of 2.50 Hz
What is the radius of the ornament? The moment of inertia of a hollow sphere of mass M and radius R about a point on its edge is 5MR2/3. A) 1.84 cm B) 3.68 cm C) 2.39 cm D) 3.98 cm E) 4.69 cm
For a specific element, photons of how many different energies could be emitted by electrons in the n = 2 level as they return to the n = 1 level?
a. 3 b. 4 c. 2 d. 1
When subsurface ground material is completely saturated with water, we call it
A) the water table. B) groundwater. C) the saturated zone. D) the unsaturated zone.