Starburst galaxies produce most of their light in the wavelength range of
A) X-rays.
B) the ultraviolet.
C) the visible.
D) the infrared.
E) all wavelengths.
D
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The half-life of 131I is 8 days. On a certain day, the activity of an 131I sample is 6.4 mCi. What is its activity 40 days later?
The electric flux through the two adjacent spherical surfaces shown below is known to be the same
It is also known that there is no charge inside either spherical surface. We can conclude that
a.
there is no electric field present in this region of space.
b.
there is a constant E field present in this region of space.
c.
the electric flux has a constant value of zero.
d.
any of the above may be correct.
e.
only (a) and (b) above may be correct.
How is the presence of space debris accounted for by solar system models?
a. Space debris is left over material from the early solar system that never formed into a planet. b. Space debris was formed by the collision of objects after the planets formed. c. Space debris is material that existed in our region of space before the Sun formed. d. Space debris is left over material from the early solar system that never formed into a planet and was formed by the collision of objects after the planets formed. e. All of the other choices are correct.
The time between equinoxes on Uranus is about:
A) 7 hours. B) 8 hours. C) 21 years. D) 42 years. E) 84 years.