le son

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madi

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La vitesse de propagation du son dépend de la nature du milieu et de la température.
Le résultat sera égal à la température du soleil
Un son composé est périodique mais pas sinusoïdal. Son spectre possède plusieurs traits.
Un son pur est régulier et sinusoïdal, son spectre possède un seul trait.
Pour déterminer une période, il faut identifier le motif qui se répète (motif élémentaire), la période T est le temps de ce motif
T= temps d’un signal/ le nombre de périodes
La fréquence f se calcule par f= 1/T (résultat en Hz)
Fk= fréquence harmonique
F1= fréquence fondamentale qui se double (F2), se triple (F3),...
pour calculer Fk, on fait: k x F1 sachant que k est un nombre entier
A retenir: tout instrument joue des sons composés.
I= P/S
L= 10 x log(I/I0)

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le son

Cards (13)

2.2.3 Blood

1.1.5 Microscopy

2.5 Writing Critical Essays

2.1 Principles of Organisation

1.3.1 Key Beliefs and Teachings

4.1 The role of education in society

3.4 Jobs, career choices and ambitions

1.1.3 Cell Specialization

1.5.4 The Economy and Business

1.1 Structure and Calculation

2.1.1 Eukaryotic cells

9.3.2 Conservation

1.2 Carbohydrates

4.2 Vietnam War

1.1.3 Describing Energy Changes in a System

2.4 The marketing mix

3.4. Wildfires

1.1.2 Structures of Memory

1.1 The purpose and nature of businesses

2.2 Types of Long-Term Memory

3.5.1 Traditional Drug Sources