Radioactive Decay: A 1.0-mol sample of an isotope is decaying with a half-life of 28 y. After 61 y, how many moles of this isotope are left and what is its activity in Bq?
What will be an ideal response?
0.22 mol, 1.0 × 1014 Bq
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: Compare the relative reflected intensity in air from the surface of sodalime silica glass with an index of refraction of 1.51 and dense optical flint glass with and index of refraction of 1.65.
What will be an ideal response?
When most substances are heated, molecules inside move faster and occupy more space, which results in thermal
A) bending. B) expansion. C) contraction. D) heat.
S waves and P waves are earthquake body waves. S and P stand for
a. sudden and post. b. sigma and pi. c. slow and proper. d. secondary and primary.
Dark matter was initially proposed to explain
A) the velocities of stars and gases in spiral galaxy arms. B) stellar nebulae. C) black holes. D) the expansion of the universe.