¹⁴C/¹²C -How Have Scientists Used Isotopic Analysis to Determine That the That

question 119

Multiple Choice

¹⁴C/¹²C
-How have scientists used isotopic analysis to determine that the rise of atmospheric CO 2 is mostly from the burning of fossil fuels?

• A)¹⁴C concentrations are much higher in urban areas than in rural areas,indicating fossil fuels must have a higher ¹⁴C/¹²C ratio than carbon from other sources.
• B)The decrease in ratios of atmospheric ¹³C and ¹⁴C to ¹²C indicates that the source is fossil fuel carbon.
• C)Both coal and oil contain a high proportion of ¹⁴C.By analyzing ¹⁴C/¹²C ratios,scientists have been able to determine the source based on this fact.
• D)Since ¹⁴C is an unstable isotope,scientists have dated the atmospheric carbon to the period since the Industrial Revolution.

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