For an FCC crystal, which of the following x-ray (hkl) diffraction peaks is not present?
(a) (100)
(b) (111)
(c) (131)
(d) (200)
(a) (100)
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In what way does a 30 meter telescope outperform a 10 meter telescope?
a) The images of the 30 meter are 9 times brighter than those of a 10meter. b) The images of the 30 meter are 3 times brighter than those of a 10meter. c) All objects observed by the 30 meter telescope will appear larger than those of the10 meter. d) The 30 meter can observe light with a wavelength 3 times longer than that of the 10meter. e) The images of the 30 meter are 1/3rd as large as those of a 10 meter.
The Lyman-alpha "forest" are absorption lines in a quasar spectrum created by all of the gases along the billions of light years its energy has traversed
Indicate whether the statement is true or false
Calculate the frequency in hertz of photons of light with energy of 8.10 × 10^-19 J
a. 0.82 × 10^14 Hz b. 0.82 × 10^15 Hz c. 1.22 × 10^15 Hz d. 1.22 × 10^14 Hz
White-hot sparks from a 4th-of-July-type sparkler that strike your skin have relatively
A) high temperatures. B) few molecules per spark. C) low transfer of energy. D) all of the above E) none of the above