When an electron in an atom moves from a lower energy level to a higher one, a ______________ is ______________
a. photon; emitted
b. proton; emitted
c. photon; absorbed
d. proton; absorbed
c
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This series of images shows the pulsar at the center of the Crab Nebula looking bright every 0.033 second. Based on these data and current theory of pulsars, what can we conclude?
A) The pulsar is a neutron star that makes one full rotation every 0.033 second. B) The pulsar is a neutron star whose magnetic field switches on and off every 0.033 second. C) The pulsar is part of a close binary star system in which the two stars complete an orbit every 0.033 second. D) The pulsar has an accretion disk that undergoes an x-ray burst every 0.033 second.
Sound travel fastest in
A) water vapor. B) water. C) ice. D) steam. E) all of the above
Which of the following characterizes a shield volcano?
A) It is dormant. B) It can erupt only briefly before being dragged off the hot spot. C) It sits above a hot spot in the planet's crust or mantle. D) It forms along a plate boundary. E) It cannot grow very large, for it has a very short span of eruption.
When a nucleus in an excited state decays to the ground state, the particle emitted is a(n)
a. alpha particle b. beta particle c. gamma ray d. x ray e. none of the above