If heavier elements are more stable when they have more neutrons, what happens to the heaviest elements?
a. They have very large nuclei to sustain the number of neutrons needed for stability.
b. Above a certain atomic mass, there are no stable elements.
c. For high enough atomic mass, there is no longer a rule to determine which nuclei are stable.
d. The curve reverses and the nuclei of the heaviest elements are more even matches of protons and neutrons.
e. The curve reverses completely and the nuclei of the heaviest elements are stable with many more protons than neutrons.
b
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The rotation curve of the galaxy provides evidence for the existence of the ____________________ which extends beyond the halo of the galaxy
Fill in the blank(s) with correct word
The Local Group is ________.
A. a cluster of galaxies in which the Milky Way is located B. a star cluster to which the Sun belongs C. the group of planets around the Sun D. the name of the spiral arm of our Galaxy in which the Sun is located
The post-Newtonian age began in 1900 when
A) Einstein introduced the general theory of relativity. B) Maxwell introduced electromagnetic waves. C) Michelson declared the Newtonian age was over. D) Einstein introduced the special theory of relativity. E) Max Planck introduced the quantum of energy.
The wavelength of the wave shown in this figure is about
a.
2 m.
b.
1.75 m.
c.
0.33 m.
d.
not defined.
e.
slightly over 5 m.