Radiometric dating assumes that, once a mineral has crystallized, any daughter product results only from the decay of the original unstable parent. Some complications are
A) variations in temperature.
B) failure to take samples too close together.
C) "time clock resetting" due to metamorphism, and product leakage that yields false age estimation.
D) a poorly maintained teleometer.
Answer: C
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Uniform Circular Motion: Pulling out of a dive, the pilot of an airplane guides his plane into a vertical circle. At the bottom of the dive, the speed of the airplane is 320 m/s. What is the smallest radius allowable for the vertical circle if the pilot's apparent weight is not to exceed 7.0 times his true weight?
A. 1700 m B. 1500 m C. 2200 m D. 230 m E. 42 m
In a location where the train tracks run parallel to a road, a high speed train traveling at 60 m/s passes a car traveling at 30 m/s in the opposite direction. How long does it take for the train to be 180 m away from the car?
a. 2.0 s b. 3.0 s c. 6.0 s d. 9.0 s e. 18.0 s
In order for a photon to eject an electron from a metal's surface in the photoelectric effect, the photon's
A) frequency must be greater than a certain minimum value. B) speed must be greater than a certain minimum value. C) wavelength must be greater than a certain minimum value. D) momentum must be zero.
Spectral Series: What is the shortest wavelength of the Lyman series?
A. 91.16 nm B. 45.60 nm C. 121.5 nm D. 204.1 nm E. 365 nm