1. To what do you attribute the percent difference in p and p´ ? Do the results of your experiments agree with the law of conservation of momentum? Why or why not?

a displacement distance is size of displ

365.25 earth days are in the year of a light year

i had the same answer and put c. deflect randomly in multiple directions.   i looked it up on google and what i found was this;

scattering of light: by small particles and molecules in the atmosphere. different from reflection, where radiation is deflected in one direction, some particles and molecules found in the atmosphere have the ability to scatter solar radiation in all directions.

i know it's kinda annoying when you are just given a google article but this is why i think it is c.   i will try to let you know if i got it right.