To determine the speed of a wave, you would use which of the following formulas?

c. magnitude and direction

i think its c if i'm wrong

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.

= initial pressure

= final pressure = 2

= initial volume

= final volume = /4

= initial temperature = 20 c = 20 + 273 = 293 k

= final temperature = ?

using the equation