A long string is pulled so that the tension in it increases by a factor of four. If the change in length is negligible, by what factor does the wave speed change?
a. 0.25
c. 2.0
b. 0.50
d. 4.0
C
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If a star is in hydrostatic equilibrium
A. its radiation pressure outwards and gravitational forces inwards are in balance. B. it is generating energy at the same rate everywhere. C. it is near the end of its life. D. it is in a stable binary orbit. E. it must be losing mass.
Active galaxies are having their central engines temporarily fed by what occurrence?
A) a sudden surge in star formation in the nucleus B) a series of supernovae all occurring in the dense nuclear bulge C) a close interaction with a neighboring galaxy D) attack by a swarm of globular clusters E) the merger of a binary black hole system
In the atmospheres of the jovian planets, this component increases, systematically, with distance from the Sun
A) Hydrogen B) Helium C) Methane D) Ammonia E) Nitrogen
An emission spectrum can be used to identify a(n):
A) proton. B) electron. C) neutron. D) atom. E) neutrino.