The half life of .t meson at rest is 2.5 × 10-8 second. a beam of π+ mesons is generated at a point 15 meters from a detector. only ½ of the π+mesons live to reach the detector. find the speed of the t mesons, specifying whether you have used time dilation or length contraction

- measure reactants precisely. ( first choice)

- stir to the reaction take place. ( second choice)

- wait patiently until the reaction completes. ( fourth choice)

- make sure to recover as much copper as possible. ( last choice)

their crystal patterns have been disrupted by stress

d eras and periods

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.