Physics
(a) In the following atoms, which one is a radioisotope? Give one use of this isotope.
O16, C14, N14, He4
(b) Name the class of the lever shown in the picture below :
Radioactivity
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Answer
(a) C14 is radioisotope of C12 and C13 while O16, N14 and He4 are stable nuclei.
C14 is used to determine the age of ancient biological materials, such as fossils, bones, or archaeological samples (up to about 50,000 years old).
(b) CLass II lever.
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