A boat is floating in a small pond. The boat then sinks so that it is completely submerged. What happens to the level of the pond?
a. It increases.
b. It decreases.
c. It stays the same.
d. In some cases it would decrease, in others it would stay the same.
e. In some cases it would increase, in others it would stay the same.
b
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The most common isotope of oxygen has atomic number 8 and atomic mass number 16. Another isotope has two extra neutrons. What are the atomic number and atomic mass number of this isotope?
What will be an ideal response?
If a fossil bone is found to contain 1/16th as much Carbon-14 as the bone of a living animal, what is the approximate age of the fossil? (half-life of 14C = 5730 years)
a. 7640 years c. 45,800 years b. 22,900 years d. 17,200 years
Triton has a retrograde orbit around Neptune. This means that ____________
a. Triton orbits in the same direction as Neptune rotates on its axis. b. Triton orbits in the opposite direction to the way Neptune rotates on its axis. c. Triton does not orbit around Neptune. Instead, it stands still.
Why do astronomers need different telescope designs to observe across the electromagnetic spectrum?
A) New telescopes incorporate new technology to increase their efficiency. B) Telescopes have to adapt to the greater distortion of the atmosphere at shorter wavelengths. C) Photons of different energy have different wavelengths, some of which are not accessible from Earth's surface and require different collection strategies. D) Light pollution is worse at radio wavelengths than visible wavelengths. E) Astronomers and engineers enjoy the challenge of making new telescope designs.