MCQ practice · SSC Physics Board questions · Chapter 13: Radioactivity and Electronics
By observing the presence of which of the following can an idea of the age of a fossil be obtained?
Think it through first, then pick an option.
- a ¹³C
- b ¹⁴C
- c ²³⁵U
- d ¹³³Cs
Answer and explanation
Correct answer: b ¹⁴C
From how much of the ¹⁴C in the body has fallen, the age of an ancient fossil is found accurately.
Why the other options are wrong
- a ¹³C: ¹³C is a stable isotope of carbon; the radioactive ¹⁴C is used for finding the age of ancient fossils.
- c ²³⁵U: ²³⁵U is an isotope of uranium; it is not used for dating fossils; ¹⁴C is.
- d ¹³³Cs: ¹³³Cs is not in this chapter; fossils are dated with the radioactive carbon isotope ¹⁴C.
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