How are elements heavier than iron made? Why are they rare?
What will be an ideal response?
The elements heavier than iron are formed when protons and neutrons are crammed into nuclei making up the outer layers of massive stars as those layers are hurled into the interstellar medium during a supernova event. These conditions do not last long, so there is very little time for the creation of these elements.
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Fundamental Forces: A stable nucleus contains many protons very close to each other, all positively charged. Why do the protons not fly apart due to mutual Coulomb repulsion?
A. An attractive nuclear force in the nucleus counteracts the effect of the Coulomb forces. B. There are an equal number of electrons in the nucleus which neutralize the protons. C. The neutrons in the nucleus shield the protons from each other. D. The Coulomb force does not operate within nuclei. E. The gravity of the protons and neutrons overcomes their repulsion at such close distances.
Chromatic aberration is a consequence of different colors in a lens having different
A) aberrations. B) frequencies. C) energies. D) critical angles. E) speeds.
Two stars both lie on the main sequence. Star X is spectral type A, while Star Y is spectral type G. Star X must be more massive than Star Y
Indicate whether the statement is true or false
If the distance from the Sun to the Earth is represented by roughly 15 meters, then the distance from the Earth to the Moon on the same scale would be
a. about 30 meters. b. about 10 meters. c. about 1 meter. d. small than your hand.