Marie and Pierre Curie Were Working with an Ore That

question 27

Multiple Choice

Marie and Pierre Curie were working with an ore that contained uranium, but found that its radioactivity was higher than could be explained by the uranium in it.What conclusion would be suggested by the method of residues?

• A)The ore contained another radioactive element.
• B)Uranium is not radioactive.
• C)The uranium in the ore was different from other uranium.
• D)The ore should be thrown away immediately and all of its residues cleaned up.
• E)Radioactivity works differently than the Curies had previously believed.

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Definitions:

Petty Cash

A small amount of cash on hand used for covering minor and incidental expenses in an organization.

Payment

The act of transferring money or its equivalent in exchange for goods or services.

Postage Stamps

Adhesive paper evidence of prepayment for postal services, used to send letters and packages.

Cash Equivalent

Short-term, highly liquid investment assets that are readily convertible to known amounts of cash and are subject to insignificant risk of changes in value.