The of the pendulum is the time in takes, in seconds, for the pendulum to make a full swing, moving from one side to the other and back again.
a. period b. amplitude c. pivot d. bob

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.