List of top Physics Questions on Radioactive Decay asked in AP EAPCET

An ancient discovery found a sample, where \(75\%\) of the original carbon \((C^{14})\) remains. Then the age of the sample is \((T_{1/2}(C^{14})=5730\ \text{years},\ \ln0.5=-0.7,\ \ln(0.75)=-0.3)\)