Author Question: Roughly how many different chemical compounds are there? A) 20 B) 100 C) 4 D) 500 E) many ... (Read 19 times)

jlmhmf · **on:** Jul 29, 2018

Roughly how many different chemical compounds are there?

A) 20
B) 100
C) 4
D) 500
E) many more than 500

Question 2

A proton beam that carries a total current of 1.3 mA has 10.0 mm diameter. The current density in the proton beam increases linearly with distance from the center.

This is expressed mathematically as J(r) = J0 (r/R), where R is the radius of the beam and J0 is the current density at the edge. Determine the value of J0. A) 25 A/m2
B) 6.2 A/m2
C) 12 A/m2
D) 17 A/m2