A lightbulb drawing a current of 0.60 A is run for 2.0 hours. How many electrons pass through the bulb during this process?
a. 2.7 × 10^22 b. 1.4 × 10^19
c. 5.4 × 10^25 d. 4.3 × 10^3
a
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The neutral hydrogen atom consists of
a. one proton and one neutron. b. one proton. c. one proton, one neutron, and one electron. d. one proton and one electron. e. an isotope and an ion.
Star clusters are important to our study of stars because
a. all stars formed in star clusters. b. the Sun was once a member of a globular cluster. c. they give us a method to test the our theories and models of stellar evolution. d. they are the only objects that contain Cepheid variables. e. All of the other choices are correct.
The large moons of Jupiter have low densities suggesting compositions that are a mixture of rocky materials and ________
Fill in the blank(s) with correct word
Which of the following correctly describes the concept of galactic recycling?
A) New stars are continuously being formed in the Milky Way out of gas that has been ejected from a previous generation of stars. B) In the formation of a star, no matter is wasted as all excess material ends up recycled into planets. C) Stars near the center of the Milky Way are continually recycled to the outskirts of the disk by their orbital motion. D) Life is continuously being spread from star to star in the Milky Way. E) New galaxies are continuously being formed out of gas ejected from a previous generation of galaxies.