Multiplication is commutative. So both
V=IR and V=RI is same and correct formula of Ohm's law.
It belongs to hydrides, it’s a nitrogen hydride
It is a base because of pH and because it’s a soluble vase it is an alkali
The correct answer is:
D. Electromagnetic waves.
The arrows represent electromagnetic waves.

A Mechanical wave is a wave the does require a medium to transfer.