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Image: Picture of the first 'wall formula' in the city of Utrecht 01

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Description: This is the 8th wall formula in the Netherlands (the first 7 are in Leiden). This Utrecht one is very different in style than the Leiden ones and depicts an experiment to test a formula, rather than the formula itself. The Doppler effect is the phenomenon that sounds (or light) changes its frequency to the observer if the source has a non-zero velocity (to or fro). It is known to everyone who has heard an ambulance pass by. Prof. Buys Ballot tested it using a horn blower on a train. Nederlands: Illustratie van de demonstratie van het Doppler effect door Buys Ballot. Op een trein die reed over de spoorlijn tussen Utrecht en Maarssen zette Buys Ballot koperblazers. Waarnemers langs de spoorlijn noteerden het verschil in toonhoogte tijdens het passeren van de trein. Deze gevelschildering brengt dit in beeld en is in 2019 aangebracht aan de Burgemeester Reigerstraat in Utrecht. De schildering is gemaakt door kunstenaarscollectief De Strakke Hand
Title: Picture of the first 'wall formula' in the city of Utrecht 01
Credit: Own work
Author: Sense Jan van der Molen
Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: https://creativecommons.org/licenses/by-sa/4.0
Attribution Required?: Yes

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