Author Question: A distinctive feature of quarks is that they A) are always observed singly, since they do not ... (Read 66 times)

mydiamond · **on:** Jul 27, 2018

A distinctive feature of quarks is that they

A) are always observed singly, since they do not readily interact with other particles.
B) have zero charge.
C) have zero rest mass.
D) have fractional electric charge.

Question 2

A rad is

A) a dosage of 2.58 10-4 C/kg.
B) 10-2 J/kg.
C) the SI unit of radioactivity ( = 1 decay/s).
D) the SI unit of absorbed dose = 1 J/kg = 100 rad.
E) 3.70 1010 decays/s in radium.