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Solution


Q.

Which of the following statement is not true for radioactive decay               [2025]
1 Amount of radioactive substance remained after three half lives is 18 th of original amount.  
2 Half life is ln 2 times of 1rate constant  
3 Decay constant increases with increase in temperature.  
4 Decay constant does not depend upon temperature.  

Ans.

(3)

Arrhenius equation does not apply to nuclear reactions. For nuclear reactions the decay constant is independent of temperature.