What evidence do we have that the sunspots are magnetic?
What will be an ideal response?
Astronomers measure magnetic fields on the Sun using the Zeeman effect. When an atom is in a magnetic field, the electron energy levels are altered, and the atom is able to absorb photons with a greater variety of wavelengths than the same atom not in a magnetic field. Magnetic images of the Sun show that sunspots contain magnetic fields a few thousand times stronger than Earth's.
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Suppose you climb the stairs of an eight-story building, about 24 m high, and your mass is 70 kg. The gravitational potential energy you gain is about
A. 40 calories. B. 16,500 calories. C. 40 Joule. D. 16,500 Joule.
One "food calorie" equals 1000 calories
a. True b. False Indicate whether the statement is true or false
In an energy diagram, what does the difference between the energy line and the potential energy line represent?
A. Change of thermal energy B. Energy leaving the system C. All of these are correct. D. Kinetic energy
A shift in the position of an emission line of an element toward the red or blue is produced by ____
a. atoms that become ionized b. electrons that transfer from a high energy level to a low energy level c. electrons that transfer from a low energy level to a high energy level d. the intensity of agitation of atoms in a hot gas e. the motion of an object toward or away from the observer