The final temperature of 1 liter of 40°C water poured into 1 liter of 20°C water is
A) less than 30°C.
B) at or about 30°C.
C) more than 30°C.
Answer: B
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Which of the following lists the layers of a generic planetary atmosphere in the correct order from lowest to highest altitude?
A) troposphere, stratosphere, exosphere, thermosphere B) thermosphere, troposphere, stratosphere, exosphere C) stratosphere, troposphere, exosphere, thermosphere D) stratosphere, thermosphere, troposphere, exosphere E) exosphere, troposphere, stratosphere, thermosphere
Which of the following best describes why radio telescopes are generally much larger in size than telescopes designed to collect visible light?
A) Getting an image of the same angular resolution requires a much larger telescope for radio waves than for visible light. B) Radio telescopes are designed to collect sound rather than light. C) It is because radio telescopes are used in the daytime and visible light telescopes are used at night. D) Objects that emit radio waves are always much larger than objects that emit visible light, and therefore require larger telescopes.
About 85% by mass of Earth's core is composed of the element(s)
a. iron b. nickel c. oxygen. d. silicon. e. iron and nickel.
Which of the following terms describe lenses that are thicker at the center than at the edges? (There could be more than one correct choice.)
A) converging lenses B) diverging lenses C) concave lenses D) convex lenses