Which of the following is the correct Lewis structure for ammonia (NH3)? Note: Hydrogen and nitrogen have one and five valence electrons
respectively.
Н
H
1
N
H-N-H
H-N-H
H-N-H
-
Н
H
Н
Н
H
А
B
с
D
E
A figure A
B. figure B
C. figure C
D.
figure D
E.
figure E

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

Suppose you have three polarizing filters, with the second at an angle of 42∘ to the first and the third at an angle of 90∘ to the first. by what perfect will the original intensity of unpolarized light be reduced to after passing through all three filters?

The slope of a velocity time graph over any interval of time gives the during that interval