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
b. 235U
c. 232Th
d. 237Np
a
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Suppose you have a time-keeping device that always reads precisely 12:00 when the Sun crosses your meridian. What kind of time is this clock keeping?
A) mean solar time B) standard time C) apparent solar time D) universal time
A fish appears to be 2.00 m below the surface of a pond when viewed almost directly above by a fisherman. What is the actual depth of the fish? (nwater = 1.33)
A) 2.66 m B) 0.67 m C) 1.5 m D) 0.38 m
A common scale for denoting a mineral's hardness is the
a. Ores scale. b. Mohs scale. c. Homs scale. d. Ohms scale.
An incredible amount of electrical energy passes down the funnel of a large tornado every second. Measurements taken in Oklahoma at a distance of 9.00 km from a large tornado showed an almost constant magnetic field of 1.50 × 10^-8 T associated with the tornado. What was the average current going down the funnel? (µ0 = 4p × 10^-7 T×m/A)
a. 450 A c. 950 A b. 1500 A d. 675 A