An electron and a positron, each having kinetic energy 1.843 GeV, annihilate, producing a proton and antiproton pair (M = 938.3 MeV/c2). What is the kinetic energy of the antiproton produced in this way?
A. 0.938 GeV
B. 0.905 GeV
C. 1.586 GeV
D. 1.843 GeV
B. 0.905 GeV
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According to the "galactic fountain" model, what can create a superbubble emerging into the halo?
A) winds and jets from newly formed protostars B) a supernova occurring in the halo C) multiple supernovae occurring near one another around the same time D) the combined effect of spiral density waves E) molecular clouds expelled from the galactic center
As material leaves an expanding star and begins to fall into a white dwarf close companion
a. an accretion disk will form around the white dwarf. b. the material will cool off because it begins to move at high velocities. c. the material will fall directly straight onto the surface of the white dwarf. d. the white dwarf will produce a protostar. e. the white dwarf's iron core will collapse.
Large icebergs in the Arctic and Antarctic form as
A) frozen seawater thickens. B) sea ice forms next to continental land. C) glaciers calve into the sea. D) alpine glaciers melt in Arctic and Antarctic waters.
Rotation of the protostar helps generate the magnetic fields and bipolar flows
Indicate whether the statement is true or false