Ultraviolet radiation from a star:
A) gets almost completely absorbed before it reaches Earth's surface.
B) has a wavelength that is longer than the visible light emitted by the star.
C) has a wavelength that is shorter than the X-rays emitted by the star.
D) reaches most of Earth's surface through atmospheric windows.
A
You might also like to view...
A person looking through eyeglasses sees
a. real images. b. virtual images. c. erect images. d. inverted images. e. polarized images.
Cells at the top of a tree have a higher concentration of sugars than cells at the bottom. How might this fact assist a tree in moving water upward from its roots?
A) Cells with high concentrations of sugar are more dense. As these cells migrate downwards, cells containing fresh water are able to migrate upwards. B) Water is pushed upwards by osmostic pressure. C) It doesn't. In fact, water makes it to the top of a tree because that is where the water molecules are being evaporated. D) Fresh water is drawn upwards to the sugar containing cells by way of dipole-dipole molecular interactions.
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 proton has a total energy of 2.5 × 10?10 J. How fast is it moving? (mp = 1.67 × 10?27 kg)
A. 0.90c B. 0.80c C. 0.70c D. 0.60c E. 0.40c