User talk:93.56.174.94

May 2021
Hello, I'm DVdm. Your recent edit to Doppler effect appears to have added incorrect information, so I removed it for now. If you believe the information was correct, please cite a reliable source or discuss your change on the article's talk page. If you think I made a mistake, or if you have any questions, you can leave me a message on my talk page. Thank you. DVdm (talk) 17:51, 16 May 2021 (UTC)