Starting with a sample of pure parent radionuclide, what would be the ratio of the parent radionuclide to its daughter after two half-lives have elapsed?
a. 1 to 1
b. 1 to 2
c. 1 to 3
d. 1 to 4
c
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What evidence leads astronomers to conclude that most of the Milky Way's mass consists of a mysterious dark matter?
A) We observe many dark clouds of gas that block the light of stars behind them. B) The galaxy's rotation indicates that it must contain much more matter than we can observe with our telescopes. C) Observations indicate that most stars are dimmer than the Sun, so we say they are "dark." D) Stars are separated from one another by vast distances, and therefore most places in the galaxy would be dark to our eyes.
Humans’ use of rocks and minerals as building materials is an example of which interaction?
A deuteron is captured by an oxygen-16 atom which in turn emits a proton. What is the element and mass number of the product isotope?
a. oxygen-15 c. nitrogen-15 b. fluorine-15 d. oxygen-17
You can see your image in a mirror because of
a. interference b. diffraction c. specular reflection d. diffuse reflection e. polarization