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A particle known as a pion lives for a short time before breaking apart into oth

ID: 2242857 • Letter: A

Question

A particle known as a pion lives for a short time before breaking apart into other particles. Suppose a pion is moving at a speed of 0.989c, and an observer who is stationary in a laboratory measures the pion's lifetime to be 3.4

A particle known as a pion lives for a short time before breaking apart into other particles. Suppose a pion is moving at a speed of 0.989c, and an observer who is stationary in a laboratory measures the pion's lifetime to be 3.4 Times 10-8 s. (a) What is the lifetime according to a hypothetical person who is riding along with the pion? (b) According to this hypothetical person, how far does the laboratory move before the pion breaks apart?

Explanation / Answer

(a)

the life time according to the hypotheticalperson who is riding along with pion will be

?t = (?to) /?[1 - (v2 / c2)]

=2.299 x 10-7 s



(b)

distance moved will be

L = v ?t

= 0.989 * 3 * 10^8 * 0.2299 x 10-8 m


=0.682 m

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