User talk:5.197.249.96

March 2021
Hello, I'm DVdm. I wanted to let you know that I reverted one of your recent contributions—specifically this edit to Doppler effect—because it did not appear constructive. If you would like to experiment, please use the sandbox. If you have any questions, you can ask for assistance at the Help desk. Thanks. DVdm (talk) 22:57, 12 March 2021 (UTC)
 * If this is a shared IP address, and you did not make the edits referred to above, consider creating an account for yourself or logging in with an existing account so that you can avoid further irrelevant notices.

Please refrain from making unconstructive edits to Wikipedia, as you did with this edit to Doppler effect. Your edits appear to be vandalism and have been reverted or removed. If you would like to experiment, please use the sandbox. Repeated vandalism can result in the loss of editing privileges. Thank you. DVdm (talk) 13:31, 13 March 2021 (UTC)