Abstract
In physics, whenever we cannot do an experiment for physical, technological, financial or ethical reasons, we use "thought experiment". In this letter we will prove that sometimes a thought experiment may lead us to the wrong results and we will prove that to achieve the correct results, an experiment must be done in the real world.



![Author ORCID: We display the ORCID iD icon alongside authors names on our website to acknowledge that the ORCiD has been authenticated when entered by the user. To view the users ORCiD record click the icon. [opens in a new tab]](https://www.cambridge.org/engage/assets/public/coe/logo/orcid.png)