IYPT 2000, Задачи на турнира — Задача 17. A strange sound

13th IYPT (2000)

Заглавие в източника

Source: metal.elte.hu 2000
Selected at the Preparatory Seminar in Visegrád on October 22—24, 1999
Exemplary solutions for 2000 →

Условие

Pour hot water into a cup containing some cappuccino or chocolate powder. Stir slightly. If you then knock the bottom of the cup with a teaspoon you will hear a sound of low pitch. Study how the pitch changes when you continue knocking. Explain the phenomenon.

Решение

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Оригинал в Архива: 2000.txt