Which language is used by patients who are hearing impaired

American Sign language (ASL) is used to communicate with people who have hearing impairments.

Hope this helps!

electric field is a function of 1/r^2

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

no. bullets are macro objects. wave nature is for light waves, extremely tiny particles. if a light particle was the size of your finger, the bullet would be the size of the universe. so basically, that huge difference in size makes the wave nature of matter insignificant.