Which of these is NOT a source of the shock waves that lead to protostars?
A) radiation from the OB stars in emission nebulae
B) expanding Herbig-Haro objects
C) expanding planetary nebula shells
D) violent supernovae explosions
E) collisions between galaxies
B
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Helioseismology is the study of the differential rotation and magnetic field of the sun
Indicate whether the statement is true or false
After the switch is closed in a series LR circuit, what is the current when a time equal to four time constants has elapsed?
A. (1/5) Imax B. (15/16) Imax C. (1/16) Imax D. 0.018 Imax E. 0.98 Imax
Order the following from most to least dense:
a. black hole, neutron star, white dwarf b. white dwarf, neutron star, black hole c. black hole, white dwarf, neutron star d. neutron star, white dwarf, black hole
What is the distance between a node and an antinode?
A. wavelength/1 B. wavelength/2 C. wavelength/3 D. wavelength/4