Which of the following are correct statements? Check all that apply.
A. The number of protons in an atom's nucleus defines what kind of
atom it is.
B. Atoms are the basic units of matter.
C. The atomic number is the number of electrons an atom has.
D. The number of neutrons an atom has defines what kind of
element it is.

What are the dimensions of the cross section that passes through the points a, f, g, and d?

What is the speed vfinal of the electron when it is 10.0 cm from charge 1?

When you see distant streetlights through smog, they look dimmer and redder than they do normally. but when you see the same streetlights through fog or falling snow, they look dimmer but not redder. use your knowledge of the interstellar medium to discuss the relative sizes of the particles in smog, fog, and snowstorms compared to the wavelength of light.