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. 238U
b. 236U
c. 234Th (Z = 90 for Th.)
d. Some other uranium isotope not given above.
d
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Polarization: Light passes through three ideal polarizing sheets. Unpolarized light enters the first sheet and the resultant vertically polarized beam continues through the second sheet and third sheet. The second sheet has its transmission axis at 50° with respect to the first sheet, and the third sheet is at 70° with respect to the first sheet.(a) What percent of the original intensity emerges from filter #1?(b) What percent of the original intensity emerges from filter #2?(c) What percent of the original intensity emerges from filter #3?
What will be an ideal response?
The acceleration due to gravity is 10 m/sec2. If an object falls from rest, its instantaneous speed at the end of the fifth second is (neglecting air resistance)
A) 10 m/sec. B) 5 m/sec. C) 100 m/sec. D) 50 m/sec. E) impossible to determine from the given information.
If water caused the huge outflow channels on Mars, what was the most likely process that formed them?
A) rainfall from the hydrosphere B) catastrophic but rare flooding C) annual melting of the seasonal ice caps D) large comets that struck Mars E) heat from the impact of the large asteroid that made Hellas
The temperature of a gas is most closely related to:
A. the kinetic energy of translation of its molecules B. its total molecular kinetic energy C. the sizes of its molecules D. the potential energy of its molecules E. the total energy of its molecules