According to Ohm's law, at a constant temperature, the current flowing through a conductor will be directly proportional to the potential difference between the ends of the conductor. ... We can change the proportionality sign into an equal sign by multiplying with a proportionality constant.
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Sound is produced due to vibration of different objects. Sound travels as a longitudinal wave through a material medium.Sound travels as successive compressions and rarefactions in the medium. In sound propagation, it is the energy of the sound that travels and not the particles of the medium. Sound cannot travel in vacuum.

Relative Velocity:
Suppose you are driving a car and you overtake the car in front of you. What actually happens is that the driver from the car behind you sees the car coming in the backward direction and eventually goes back. But the person standing on the ground doesn’t see it as the car is moving backwards, although the driver in that car sees it that way. This is what relative motion and relative veocity is.

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