Radiocarbon dating can be used to determine the age of
a a sample less than a million years old
b a sample less than 100,000 years old
c a sample less than 50,000 years old
- d a sample less than five million years old

Radiocarbon dating can be used to determine the age of a sample less than 50,000 years old - C

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally