A particle physicist observes cosmic rays creating a new particle high in the atmosphere, and the speed of this particle is measured at $99.7 \%$ the speed of light. It is unstable, and is observed to decay in an average $37.0 \mu \mathrm { s }$. If this particle were at rest in the laboratory, what would be its average lifetime?
A) $4.3 \mu \mathrm { s }$
B) $12 \mu \mathrm { s }$
C) $5.3 \mu \mathrm { s }$
D) $2.9 \mu \mathrm { s }$
E) $18 \mu \mathrm { s }$

Question

Quizplus · Accepted Answer

The Answer of A particle physicist observes cosmic rays creating a new particle high in the atmosphere, and the speed of this particle is measured at $99.7 \%$ the speed of light. It is unstable, and is observed to decay in an average $37.0 \mu \mathrm { s }$. If this particle were at rest in the laboratory, what would be its average lifetime?
A) $4.3 \mu \mathrm { s }$
B) $12 \mu \mathrm { s }$
C) $5.3 \mu \mathrm { s }$
D) $2.9 \mu \mathrm { s }$
E) $18 \mu \mathrm { s }$

A Particle Physicist Observes Cosmic Rays Creating a New Particle 99.7%99.7 \%99.7%

A Particle Physicist Observes Cosmic Rays Creating a New Particle $99.7 \%$