The wavelength of a radio wave from an AM station broadcasting at 1,000 kilohertz on your radio dial is __________
Fill in the blank(s) with correct word
300 m
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What factors are important when trying to classify a spiral galaxy?
a. amount of dust and gas in the galaxy b. structure of the spiral arms c. size of the central region d. All of the other choices are important.
Answer the following statement(s) true (T) or false (F)
1. The earth’s equilibrium temperature depends on its radius
Why can a 25. watt fluorescent lamp produce as much illumination as a 100. watt incandescent lamp?
What will be an ideal response?
A satellite that is in a circular orbit 230 km above the surface of the planet Zeeman-474 has an orbital period of 89 min. The radius of Zeeman-474 is 6.38 × 106 m. What is the mass of this planet? (G = 6.67 × 10-11 N ? m2/kg2 )
A) 6.0 × 1024 kg B) 5.5 × 1024 kg C) 5.0 × 1024 kg D) 6.5 × 1024 kg