How can I find out the graph between degradation rate constant and time?

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Huang Wang

thanks for your answer. can you tell me about the attached picture relation? they have the same graph line as they have for activity. I am confuse about it. please help me.

Sorry i made a mistake in writing the question. I have corrected. You mean i need to use any software to fine the value of k? Can you write the steps to follow this in Origin software?

I have found curve fitting but I couldn't get the idea to find k from this curve. please let me know further. thanks

Abdul Hameed

The explanation from Kartick is right. You can use Excel also with liner fit.