Author Question: The lifetime of a + meson normally is 18 nanoseconds. In a large particle accelerator, scientists ... (Read 82 times)

beccaep · **on:** Jul 27, 2018

The lifetime of a + meson normally is 18 nanoseconds. In a large particle accelerator, scientists can create p+ mesons moving at speeds very close to the speed of light.

What do the scientists observe when they measure the lifetime of a + meson that is created at very high speed? A) The + meson lasts 18 nanoseconds.
B) The + meson lasts much less than 18 nanoseconds.
C) The + meson lasts much more than 18 nanoseconds.
D) The + meson no longer decays, and remains as a stable particle.

Question 2

The distinguishing feature of a starburst galaxy is

A) the presence of an unusually large number of binary star systems containing X-ray bursters.
B) a very large luminosity compared to the total luminosity of the Milky Way.
C) strong radio emission from lobes of material well outside the visible boundaries of the galaxy.
D) a rate of star formation that may be 100 or more times greater than that in the Milky Way.