Question

A negative $\pi -meson$ at rest can decay as ${\pi }^{-}\to {\mu }^{-}+v$ . Then the energy of ${\mu }^{-}$

• A. can be anything
• B. is a fixed quantity
• C. is zero
• D. is equal to 2

Answer 1

The correct option is B is a fixed quantity

Energy of muon $\left({\mu }^{-}\right)$ is a fixed quantity. It has rest energy of $108MeV$.