226 88Ra decays by alpha decay. What are A and Z for the daughter nuclide?
A. 226, 92
B. 222, 92
C. 226, 88
D. 222, 88
E. 222, 86
E. 222, 86
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The rate of expansion of the Universe is currently increasing
a. True b. False Indicate whether the statement is true or false
Matter Waves: Atoms in crystals are typically separated by distances of 0.10 nm. What kinetic energy must a nonrelativistic electron have, in electron-volts, in order to have a wavelength of 0.10 nm? (melectron = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
Fill in the blank(s) with the appropriate word(s).
Voids are
A. spaces between stars. B. regions in the centers of galaxies containing many black holes. C. spaces between galaxies within a cluster. D. huge regions of space with few or no galaxies.
When it comes near a heavy nucleus, a gamma ray, which is a high energy photon, can "disappear," and in its place there will be produced an electron and a positron, which both have mass. According to special relativity, this pair production is an example of __________
Fill in the blank(s) with correct word