The lowest amount of solar energy per square meter is incident upon the surface of Earth in the northern hemisphere on or about
a. December 21, the winter solstice. c. September 21, the autumnal equinox.
b. March 21, the vernal equinox. d. June 21, the summer solstice.
A
You might also like to view...
Which is true about cold dark matter?
a) Cold dark matter interacts strongly with ordinary baryonic matter via the strong force. b) Cold dark matter particles travel faster than the speed of light. c) Cold dark matter particles travel more slowly than hot dark matter particles. d) Cold dark matter exists only within planets and stars but not in other parts of galaxiesor intergalactic space. e) Cold dark matter emits X-rays, but no other forms of radiation.
Since the Helium molecule (He) is 2 times as massive as the Hydrogen molecule (H2), the speed of sound in Hydrogen is ________ the speed in Helium
A) 1.41 times B) two times C) four times D) eight times E) 1/ times
The type of radiation that is emitted when the electron in a hydrogen atom experiences a spin flip is a (n) _______________
Fill in the blank(s) with correct word
Which of the following is true of redshift?
A) Radiation that comes from great distance has tremendous redshift. B) Radiation from the hot gas of the big bang is calculated to have a redshift of about 10. C) The redshifts of different galaxies imply that these galaxies are moving toward each other. D) The redshifts of the most faint and distant galaxies known to date are about 1100.