Astronomers measured the location of the Sun in the Milky Way Galaxy by
A. counting the number of stars.
B. plotting the position of O and B stars.
C. plotting the position of globular star clusters.
D. plotting distribution of water molecules.
Answer: C
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When a nucleus in an excited state decays to the ground state, a(n) __________ particle is emitted
Fill in the blank(s) with correct word
Radioactive Decay: If the half-life of a material is 45 years, how much of it will be left after 100 years?
A. more than 1/2 B. less than 1/2 but more than 1/4 C. more than 1/4 but less than 1/2 D. less than 1/4 but more than 1/8 E. less than 1/8
The Hubble Space Telescope can detect Cepheids up to the distance of 100 Mpc
Indicate whether the statement is true or false
Deuterium is much more abundant on Venus than Earth. What do we think this fact tells us about Venus?
A) that it once had a much stronger magnetic field than it does today B) that the greenhouse effect on Venus must have been much weaker in the distant past C) that it has lost a tremendous amount of water as a result of molecules being split by ultraviolet light and the hydrogen escaping to space D) that volcanoes on Venus did not outgas as much water as volcanoes on Earth