This diagram shows the approximate depths to which different wavelengths of light penetrate Earth's atmosphere. Why does it show an airplane?
A) Much of the infrared spectrum can be observed from an airplane that flies above most clouds.
B) Airplanes are useful for astronomical observations at all wavelengths of light that do not reach the ground.
C) Telescopes on airplanes are better than telescopes on the ground for both visible-light and infrared observations.
D) The airplane is just decorative, indicating that astronomers use airplanes to fly to ground-based observatories.
A) Much of the infrared spectrum can be observed from an airplane that flies above most clouds.
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The planet in our solar system with the highest average surface temperature is ________
A) Venus B) Earth C) Neptune D) Mercury
Compared with the amount of current in the filament of a lamp, the amount of current in the connecting wires is
A) definitely less. B) often less. C) actually more. D) the same. E) incredibly, all of the above
Helium fusion does not begin until the star has entered the giant region of the H-R diagram
Indicate whether the statement is true or false
A combination of two or more substances in which they no longer retain their chemical properties is called a(n)
A) mixture. B) compound. C) heterogeneous mixture. D) periodic trend. E) suspension.