A sample of radioactive element has rate at time and at time ( )

CHEMISTRY · Single correct · US High School · Chemistry · Atomic Structure & Nuclear · Atomic Structure & Nuclear

Problem

A sample of radioactive element has rate R1R_1 at time t1t_1 and R2R_2 at time t2t_2 (t2>t1t_2 > t_1). Which one is not correct if λ\lambda is rate constant and τ\tau is average life? a. R1>R2R_1 > R_2 No. of atoms decayed in time (t2−t1)=R1−R2λ(t_2 - t_1) = \frac{R_1 - R_2}{\lambda} No. of atoms decayed in time (t2−t1)=(R1−R2)×τ(t_2 - t_1) = (R_1 - R_2) \times \tau No. of atoms decayed in time (t2−t1)=R2−R1λ(t_2 - t_1) = \frac{R_2 - R_1}{\lambda} (1) R1>R2R_1 > R_2 (2) No. of atoms decayed in time (t2−t1)=R1−R2λ(t_2 - t_1) = \frac{R_1 - R_2}{\lambda} (3) No. of atoms decayed in time (t2−t1)=(R1−R2)×τ(t_2 - t_1) = (R_1 - R_2) \times \tau (4) No. of atoms decayed in time (t2−t1)=R2−R1λ(t_2 - t_1) = \frac{R_2 - R_1}{\lambda}

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