Electrons moving in a strong magnetic field emit ____________________ radiation
Fill in the blank(s) with correct word
synchrotron
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On the scale of the cosmic calendar, in which the history of the universe is compressed into 1 year, when did Kepler and Galileo first discover that we live on a planet in a solar system?
A) 1 second ago B) 1 day ago C) 1 week ago D) December 25 E) December 30
This diagram shows the approximate depths to which different wavelengths of light penetrate Earth's atmosphere. Why does it show an airplane?
A) Much of the infrared spectrum can be observed from an airplane that flies above most clouds. B) Airplanes are useful for astronomical observations at all wavelengths of light that do not reach the ground. C) Telescopes on airplanes are better than telescopes on the ground for both visible-light and infrared observations. D) The airplane is just decorative, indicating that astronomers use airplanes to fly to ground-based observatories.
The final temperature of 1 liter of 40°C water poured into 1 liter of 20°C water is
A) less than 30°C. B) at or about 30°C. C) more than 30°C.
A transformer requires
A) alternating voltage. B) direct current. C) both of these D) none of the above