When the Sun is a red giant, what will its approximate surface temperature be?
What will be an ideal response?
Approximately 3500 K
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Resolution: Treat the pupil of your eye as a circular aperture of diameter 3.5 mm. Light of wavelength 500 nm is used to view two point sources that are 283 m distant from you. How far apart must these two point sources be if they are to be just barely resolved by your eye, assuming that the resolution is limited by diffraction?
Fill in the blank(s) with the appropriate word(s).
Greenhouse gases in the atmosphere, such as carbon dioxide and water vapor, make Earth warmer than it would be otherwise because these gases __________.
a. form clouds that emit thermal radiation b. absorb infrared light emitted by the surface c. reflect visible light coming from the Sun d. absorb visible light coming from the Sun
Which of the following describes a star with a hydrogen-burning shell and an inert helium core?
A) It is a red giant that grows in luminosity until it dies in a planetary nebula. B) It is a subgiant that gradually grows dimmer as its hydrogen-burning shell expands and cools. C) It is a subgiant that grows in luminosity until helium fusion begins in the central core. D) It is what is known as a helium-burning star, which has both helium fusion in its core and hydrogen fusion in a shell.
If the principal quantum number for hydrogen is 7, which one of the following is not a permitted orbital magnetic quantum number for that atom?
a. 10 b. –2 c. 0 d. 5 e. 3