Heres the question before I say anything else(adsbygoogle = window.adsbygoogle || []).push({});

A beam of unknown elementary particles travels at a speed of 2.0 x 10^6 m/s. Their average lifetime in th ebeam is measrured to be 1.6 x 10^-8 s. Caclulate their average lifetime when at rest.

hmm I have no examples to go by. I figure I will have to use the formula

tm = ts/[sqrt(1-v^2/c^2)]

where tm is the time it takes when the object is moving (for example when viewing from earth and ts is the stationary time, v is speed of the object and c is speed of light)

I tried to do this by plugging in the numbers as

ts=?

v=2.0x10^8 m/s

tm=1.6x10^-8

I didn't get the right answer of 1.2 x 10^-8 s so I am assuming im wrong.

How do I do this correctly.

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# Homework Help: Time Dialation

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