The isotope 238U, which starts one of the natural radioactive series, decays first by alpha decay followed by two negative beta decays. At this point, what is the resulting isotope?
a. 234Th (Z = 90 for Th.)
b. 236U
c. 238U
d. Some other uranium isotope not given above.
D
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Galileo taught us that if you roll a ball along a level surface it will
A) soon slow down due to its natural place. B) keep rolling if friction is absent. C) roll as long as its inertia nudges it along. D) soon roll in the opposite direction.
Which of the following best describes the fundamental difference between two different chemical elements (such as oxygen and carbon)?
A) They have different numbers of protons in their nucleus. B) They have different names. C) They have different numbers of electrons. D) They have different atomic mass numbers.
When an unstable Lutetium nucleus undergoes beta decay, the nucleus formed is that of
a. Lutetium. b. Tantalum. c. Ytterbium. d. Thulium. e. Hafnium.
The index of refraction of a substance is
a)equal to the speed of light in vacuum divided by its speed in that substance. b)equal to the speed of light in that substance. c)the same as the angle of refraction. d)the same as the angle of incidence. ? ? ?