In silica glass (SiO2), there is no long-range order, but there is ______________-range order.
Fill in the blank(s) with the appropriate word(s).
short
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An explosion of genetic diversity similar to that which occurred during the Cambrian Period hasn't happened recently, most likely because
A) evolution of life on Earth is no longer occurring B) such an explosion can occur only for simple organisms and not complex ones C) there are no more ecological niches available to allow this to happen D) of the widespread presence of efficient predators that make it much more difficult for entirely new organisms to appear
Water slowly evaporates from your skin.
C. Consistent D. Inconsistent
The center of our galaxy is 30,000 light years away. Could a person possibly travel there in her own lifetime?
A) No, because a person cannot travel at lightspeed. B) No, because the trip would take longer than 30,000 years, and nobody lives this long. C) No, because time dilation applies only to clocks and not to biological phenomena such as a person's lifetime. D) Yes, by traveling at nearly lightspeed, because of time dilation or the "relativity of time." E) Yes, by traveling faster than lightspeed, because of time dilation or the "relativity of time."
What is the energy of a photon that has the same wavelength as a 24 eV electron? (h = 6.63 × 10^-34 J×s, me = 9.11 × 10^-31 kg)
a. 24 eV c. 3.5 keV b. 14 × 10^-16 eV d. 5.0 keV