When uranium-238 (Z = 92) is bombarded with a neutron, it can change into __________
Fill in the blank(s) with correct word
uranium-239
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The orbit of the planet Jupiter is ellipse with the Sun at one focus. What is located at the other focus?
a. The asteroid belt b. Earth c. Saturn d. Jupiter e. Nothing
Our Sun is made of about 28% helium (by mass). Where did this helium come from?
A) Fusion in stars B) The Big Bang only C) Mostly from fusion in stars with a small contribution from the Big Bang D) Mostly from the Big Bang with a small contribution from fusion in stars E) Radioactive decay of heavier elements only
Suppose a highway curve is properly banked to eliminate friction for a speed of 45 mph. If your tires were bald and you wanted to avoid sliding on the road, you would have to drive
A) somewhat below 45 mph. B) somewhat above 45 mph. C) at exactly 45 mph.
Your friend says that the helium used to inflate balloons is a product of radioactive decay. Another friend says no way. With whom do you agree?
A) If helium were a product of radioactive decay, we would all be radioactive. Agree with the friend that says "no way." B) Radioactive decay produces alpha particles, not helium. Agree with the friend that says "no way." C) Your first friend is correct. Radioactive isotopes emit alpha particles which, in turn, capture electrons and become helium atoms. D) Helium is an element of the periodic table, not some product of any reaction. Agree with the friend that says "no way."