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ConcepTest: Radioactive Decay part of Examples
If radioactive decay began with 400,000 parent atoms, how many would be left after 3 half lives? a. 200,000 b. 100,000 c. 50,000 d. 25,000

ConcepTest: Isotope Mass and Atomic Number part of Examples
The isotope of element X has 15 protons, 17 neutrons, and 15 electrons. The element has an atomic number of ____ and a mass number of ____. a. 15; 32 b. 17; 15 c. 17; 47 d. 15; 30

ConcepTest: Calculating Rock Age from Parent Radioactive Isotope part of Examples
A radioactive (parent) isotope of element X is discovered in different amounts in four rocks (A, B, C, D) of the same composition. Which rock has the oldest calculated age? a. 15% of element X remains in Rock A b. ...

ConcepTest: Isotopic Dating with Parent to Daughter Ratios part of Examples
The half-life of a radioactive isotope is 500 million years. Scientists testing a rock sample discover that the sample contains three times as many daughter isotopes as parent isotopes. What is the age of the rock? ...

ConcepTest: What percentage of parent isotopes remain? part of Examples
The half-life of a radioactive isotope is 1,000 million years. Scientists testing a rock sample discover that the ratio of parent and daughter isotopes indicates that the rock is 3,000 million years old. What ...

ConcepTest: Change in Porportion of Parent Isotopes Over Time part of Examples
Which graph below best represents the change in the proportion of unstable (parent) radioactive isotopes with time? a. A b. B c. C d. D

ConcepTest: Best Index Fossil part of Examples
Four outcrops of rock are examined in different locations of a state. The rock types and the fossils they contain are illustrated in the adjacent diagram. Which fossil would be the best choice to use as an index ...

ConcepTest: Ice Sheets and Water Depth part of Examples
Ice sheets covered much of the Northern Hemisphere one million years ago during part of the last ice age. How did this affect the depth of water in the oceans? a. Oceans were shallower than today b. Oceans were ...

ConcepTest: Spit Formation part of Examples
A beach is oriented east-west. It is bordered by bays at both its east and west ends. A current flowing parallel to the beach transports sand from west to east. In which bay will a spit form? a) east b) west

ConcepTest: Hot/Cold Water Circulation part of Examples
A fish tank is filled almost to the brim with room temperature water. Two containers of cold and hot water are prepared. Red coloring is added to the hot water, blue coloring is added to the cold water. The cold ...



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