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3. The $pi^0$lifetime has been determined by studying the decay from rest of the $K^+$ meson in the mode $K^+ ightarrow pi^0 + pi^+$. The average distance travelled by the $pi^0$ in a block of photographic emulsion before it decays in the easily observable mode $pi^0 ightarrow e^+ + e^- + gamma$ is measured, and from the calculated velocity of flight of the $pi^0$ its lifetime is obtained. Given that its lifetime is $0.8 imes 10^{-16}$sec, predict the average distance travelled by a $pi^0$ before it decays. (Hint: you may assume that the pions have an average mass of 137 MeV)

          3. The $pi^0$lifetime has been determined by studying the decay from rest of the $K^+$ meson in the mode $K^+ 
ightarrow pi^0 + pi^+$. The average distance travelled by the $pi^0$ in a block of photographic emulsion before it decays in the easily observable mode $pi^0 
ightarrow e^+ + e^- + gamma$ is measured, and from the calculated velocity of flight of the $pi^0$ its lifetime is obtained. Given that its lifetime is $0.8 	imes 10^{-16}$sec, predict the average distance travelled by a $pi^0$ before it decays. (Hint: you may assume that the pions have an average mass of 137 MeV)

3. The pi^0lifetime has been determined by studying the decay from rest of the K^+ meson in the mode K^+
ightarrow pi^0 + pi^+. The average distance travelled by the pi^0 in a block of photographic emulsion before it decays in the easily observable mode pi^0
ightarrow e^+ + e^- + gamma is measured, and from the calculated velocity of flight of the pi^0 its lifetime is obtained. Given that its lifetime is 0.8 imes 10^-16sec, predict the average distance travelled by a pi^0 before it decays. (Hint: you may assume that the pions have an average mass of 137 MeV)

Added by Angela H.

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