Certain types of atoms break down at a known rate. scientists can measure the amounts of the broken down products present in a sample to calculate its age.
what is this technique called?
a.
speciation
b.
the fossil record
c.
radiometric dating
d.
natural selection

3. a particle with initial velocity v⃗ 0=(5.85×103m/s)j^ enters a region of uniform electric and magnetic fields. the magnetic field in the region is b⃗ =−(1.35t)k^. you can ignore the weight of the particle. a. calculate the magnitude of the electric field in the region if the particle is to pass through undeflected, for a particle of charge +0.640 nc.