00:10
00:09
00:08
00:07
00:06
00:05
00:04
00:03
00:02
00:01
| a longitudinal wave in an elastic medium, especially a wave producing an audible sensation |
| the time required for one half the atoms of a given amount of a radioactive substance to disintegrate |
| B particle
Either of two subatomic particles in the meson family, one neutral and one positively charged, both of which have masses 10,331 times that of an electron and average lifetimes of 1.6 × 10-12 seconds. B particles contain bottom quarks. See Table at subatomic particle. |