Q. 13

Expert-verifiedFound in: Page 1082

Book edition
4th

Author(s)
Randall D. Knight

Pages
1240 pages

ISBN
9780133942651

A cosmic ray travels through the earth’s atmosphere in , as measured by experimenters on the ground. How long does the journey take according to the cosmic ray?

t' = 346.4 micro sec

We Know ;

v = d/t = 60000 / ( 400 * 10 ^ -6 ) = 1.5 * 10 ^ 8 m/s

t' = t * sqrt [ 1 - ( v / c) ^{2} ]

t' = 400 * 10 ^ 6 * sqrt ( 1 - ( (1.5 * 10 ^ 8 / (3 * 10 ^8) ) ^ 2 )) = 346.4 * 10 ^ -6s = 346.4 micro sec

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