ملف:Picture of the first 'wall formula' in the city of Utrecht 01.jpg

الملف الأصلي(4٬032 × 3٬024 بكسل حجم الملف: 2٫01 ميجابايت، نوع MIME: image/jpeg)

وصف قصير

⧼wm-license-information-description⧽
English: This is the 8th wall formula in the Netherlands (the first 7 are in Leiden) and was painted by the Dutch artist collective De Strakke Hand. 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) relative to the observer. It is known to everyone who has heard an ambulance pass by. Prof. Buys Ballot tested it using a horn blower on a train in 1845.

The formula in the painting:
f_w = f_b . (v + v_w) / (v - v_b), with
f_w = the frequency f of the sound as measured by the observer w.
f_b = the frequency f of the sound as emitted by the source b.
v_w = the velocity v with which the observer w is moving.

v_b = the velocity v with which the source b is moving projected on the same direction.

(Dutch)

⧼wm-license-information-date⧽ 2019, {{time}} – invalid date format 27 (help)
⧼wm-license-information-source⧽ ⧼Wm-license-own-work⧽
⧼wm-license-information-author⧽ Sense Jan van der Molen
⧼wm-license-information-other-versions⧽

قالب:Image extracted

52°05′25″N 5°08′03″E / 52.090275°N 5.134164°E / 52.090275; 5.134164 references are: www.wallformulas.org, www.muurformules.nl and www.utrechtsemuurformules.nl

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زمن/تاريخصورة مصغرةالأبعادمستخدمتعليق
حالي ★ مراجعة معتمدة
05:21، 7 نوفمبر 2023
تصغير للنسخة بتاريخ 05:21، 7 نوفمبر 20234٬032 × 3٬024 (2٫01 ميجابايت)Pastakhov (نقاش | مساهمات)Upload https://upload.wikimedia.org/wikipedia/commons/4/43/Picture_of_the_first_%27wall_formula%27_in_the_city_of_Utrecht_01.jpg

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