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Half life and Mean Life.
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In this lesson I have explained about Half life and Mean life of a radioactive substance.

Amrit Lal
Top Physics Educator 80% questions in NEET19 were directly from my lessons. Mentor/Motivator. Author. Youtube- iStart-Education

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U
Unacademy user
You may also add "Before Sunrise", "Before Sunset" to the list..
thanku sooo much sir 👌