A Particle Physicist Observes Cosmic Rays Creating a New Particle

question 11

Multiple Choice

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 μs.If this particle were at rest in the laboratory,what would be its average lifetime?

• A)2.9 µs
• B)18 µs
• C)5.3 µs
• D)12 µs
• E)4.3 µs

---

Definitions:

Misrepresentation

The assertion of a fact that is not in accord with the truth. A contract can be rescinded on the ground of misrepresentation when the assertion relates to a material fact or is made fraudulently and the other party actually and justifiably relies on the assertion.

Material Fact

A fact that is significant or essential to the issue or matter at hand, and if known, could influence an individual's decision in a transaction, contract, or legal case.

Reliance

The act of depending or counting on something or someone; in legal contexts, it often refers to actions taken based on the trust in a promise or statement by another party.

Good Faith

An honest intention to act without taking an unfair advantage over another party, often a principle in contract law.