Question

why does a car not seem to travel in the form of a wave although de Broglies relation is applicable to it​

Answer 1

Explanation:

de broglies relation is observable only a very small particles because the waves that are made if seen by the naked eye seems to be a straight line.

if you want the mathematical proof then just thin that we are differentiating or taking a very minute part of a seemingly large wave

Answer 2

This is because the particle has dual nature they can be in the form of particle nature or wave nature when you are not watching it they are in wave nature and when you are watching it they are in the form of particle nature..

De broglie equation is applicable for microscopic particles not for macroscopic

HOPE IT WILL HELP YOU