In the four radioactive series, the nuclei decay by either emitting alpha particles or beta particles until they reach the stable end product. Each decay, therefore, results in a mass number change of either 4 (for alpha decay) or 0 (for beta decay). The radium isotope 226Ra is in one of these series. What is the starting isotope in the series containing 226Ra?
a. 238U
c. 232Th
b. 235U
d. 237Np
A
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At which planet can the pole remain in darkness for 42 years, then have 42 years of constant daylight?
A) Pluto B) Neptune C) Uranus D) Jupiter E) Saturn
A heat pump is capable of delivering more energy to the home than goes into the operation of the pump itself, when conditions are favorable. Which of the following statements is correct?
A. A heat pump violates the first law of thermodynamics B. A heat pump, like the Carnot engine, is a theoretical device that is not useful in practice C. A heat pump is more efficient when the outside temperature is colder D. A heat pump violates the second law of thermodynamics E. A heat pump transfers some energy from the outdoors
A fossil is found in a layer of strata below one layer dated at 8 million years. From this we can deduce the age of the fossil to be
A) between 7 and 8 million years old B) we can tell nothing about the fossil's age from this data C) older than 8 million years D) younger than 7 million years
A body oscillates with simple harmonic motion along the x axis. Its displacement varies with time according to the equation x = 5.0 cos (?t). The magnitude of the acceleration (in m/s2) of the body at t = 1.0 s is approximately
A. 3.5. B. 49. C. 14. D. 43. E. 4.3.