If a rock sample contains uranium and lead, but no lead-204 is present, then
a. all the lead is radiogenic.
b. all the lead is primordial.
c. both radiogenic and primordial lead are present.
d. neither radiologic nor primordial lead is present.
a
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Which of the following is true regarding the masses of antimatter particles?
A) The mass of an antimatter particle is the same as that of its corresponding matter particle. B) The mass of an antimatter particle is always larger than that of its corresponding matter particle. C) The mass of an antimatter particle is always lower than that of its corresponding matter particle. D) The mass of an antimatter particle is the negative value of that of its corresponding matter particle. E) Antimatter has no mass.
Alec and Michelle release their snowballs from the same height, at the same time and with the same speed. Alec's is thrown upward while Michelle’s is thrown downward. Which one hits the ground with the greatest speed (ignore air resistance)?
A. the one thrown upward B. the one thrown downward C. they hit with the same speed D. it depends on the initial height
What is an artificial star?
A) a meteor B) the unseen member of a binary star system C) a satellite orbiting Earth D) a point of light in Earth's atmosphere created by a laser for the purpose of monitoring atmospheric fluctuations E) a possible source of dark matter in the universe
If the fifth order minimum in the diffraction pattern of a thin slit is at 40° from the central maximum, what is the highest order minimum in the pattern?
A) 6 B) 11 C) 8 D) 7 E) 9