The Half-Life of Cobalt-60 Is 5

question 44

Multiple Choice

The half-life of cobalt-60 is 5.3 years,while that of strontium-90 is about 29 years.Suppose you have samples of both isotopes,and that they initially have the same activity (number of decays per second) .What must be true of the numbers of cobalt-60 and strontium-90 nuclei in these samples?

• A)There are more strontium-90 than cobalt-60 nuclei.
• B)There are equal numbers of cobalt-60 and strontium-90 nuclei.
• C)There are more cobalt-60 than strontium-90 nuclei.
• D)It is not possible to compare numbers of nuclei without knowing the masses of the samples.

Understand the mechanisms and conditions affecting igneous rock textures.

Identify and categorize various igneous rock textures such as welded, glassy, vesicular, and porphyritic textures.

Distinguish between the formational environments of igneous rocks based on texture and composition.

Describe the processes involved in the cooling and solidification of magma or lava and their outcomes on rock texture.

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Definitions:

Hybrid Varieties

Plant varieties developed through the crossbreeding of two genetically different parent plants, aiming to produce offspring with desirable traits from both.

Partnerships

A form of business organization in which two or more individuals share ownership, responsibilities, and the profits or losses of the enterprise.

Corporations

Legal entities that are separate from their owners, providing limited liability protection, and have the ability to raise capital by issuing shares.

19th Century

The period from January 1, 1801, to December 31, 1900, marking the nineteenth century of the Gregorian calendar.