Question

A massive K is produced at point A and travels to point B where it decays. A stationary observer in the lab and an observer moving by at 0.6c will agree on

Group of answer choices

a) event A happening before event B.

b) the time it takes the particle to travel from A to B.

c) the distance from A to B.

d) the speed the K particle was moving.

Observer A sees a moving charged particle collide with a stable stationary particle. The collision causes the stationary particle to break into two particles which move off afterward.

To observers in other reference frames,

Group of answer choices

a) the collision always precedes the breaking of the particle.

b) The breakup of the particle may precede the collision.

c) the stationary particle may not be stable.

d) the same laws of physics hold, so the energies and momentuma are the same.

Please answer both questions! thank you

Answer 1

Sol: Both the observer will agree on-

a) event A happening before event B.

Sol: To observers in other reference frames will be agree on -

a) the collision always precedes the breaking of the particle.
The concept is that time can not be revers or time can not negative. Or we can say dependent event can not be revers. i.e no one can die first then take birth in any frame of refference.