Although this part of the detector cannot detect the , we can deduce where it was, and so we have now drawn in its track (zoom right in to see it). Click on the track to find out some information about it.

As the is travelling so rapidly (note its velocity!) it is subject to relativistic effects such as time dilation (as were the muons coming down the mountain).

In order to calculate the 's lifetime in its own inertial frame, we first need to find its factor, and its lifetime in our inertial frame.

Insert the velocity of the in the equation you solved on worksheet 1 to find its factor.

Now, use the velocity and the length of the 's track to find its lifetime in our inertial frame, then use the factor to find its lifetime in its own inertial frame (i.e. its lifetime when it is at rest).

When you have done this, click on the answer you think is correct. Once you have answered correctly, you can move on to the final part.

What is the value of the K⁰'s lifetime in its own inertial frame?

• 5.276 x 10^-11 seconds
• 2.638 x 10^-11 seconds
• 1.041 x 10^-11 seconds

Previous