The main lens or mirror of a telescope is called the ____________________
Fill in the blank(s) with correct word
objective
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Aside from Earth, Venus is the most likely place for life to exist in the Solar System
a. True b. False Indicate whether the statement is true or false
Radioactive Decay: One material used in nuclear bombs is 239Pu, with a half-life of 24,000 years. How long must we wait for a buried stockpile of this substance to decay to 1/1000 of its original activity?
A. 1,200,000 years B. 240,000 years C. 150,000 years D. 82,000 years E. 1500 years
Which was NOT a Voyager discovery about the rings of Saturn?
A) They are made of tens of thousands of narrow ringlets. B) The F ring particles are herded by two shepherd moons. C) They have dark spokes that defy gravity. D) There are hundreds of smaller moons imbedded in them, creating the gaps. E) The E ring may have been made by volcanic eruptions from Enceladus.
According to quantum theory, a macroscopic object such as a baseball
A) has no wavelength at all. B) has an infinite wavelength. C) has a very short wavelength. D) has a very long wavelength. E) is really made out of microscopic baked beans.