The neutron (n) is an unstable particle (decaying as n - pe ve) with an "average" lifetime of tn 882s, i. e., its abundance decreases as n(t)no exp(-t/tm) after initial production. suppose n's are produced on mars (for example, by a nuclear reactor) emitted in the direction of earth, 55 106 km away. (a) if the neutron is produced at a speed of 0.1c, how much time will pass in: (i) the earth-mars rest system (i) the neutron's rest system? (b) what percentage, p(t)-n(t)/no, of neutrons makes it to earth: (i) with; or (ii) without the effect of special realtivity? (c) repeat parts (a) and (b) for an initial speed of 0.5c.

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i believe it is b. what was the cause of the big bang

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it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me