Elementos de una onda: amplitud, periodo, frecuencia, velocidad/Wave Parts:Amplitude, frequency

Characteristics of Waves

Introduction to Wave Properties

• The lesson introduces the characteristics and properties of waves, focusing on wave motion and its elements.

Key Elements of Waves

• Amplitude is defined as the distance from the equilibrium line to the highest point (crest) of a wave, measured in centimeters, meters, or nanometers.

• Elongation refers to any distance measured from the equilibrium line to a point on the wave; amplitude represents maximum elongation.

• The crest is the highest point of a wave, while the valley is its lowest point. Points where the wave crosses the equilibrium line are called nodes, and opposite points are anti-nodes.

Wavelength Definition

• Wavelength (λ) can be measured from crest to crest or valley to valley and represents one complete cycle of a wave.

• Units for wavelength include meters per cycle or centimeters per cycle; it indicates how far a wave travels during one complete oscillation.

Understanding Cycles and Frequency

Definition of Cycle

• A cycle is described as a complete oscillation between two crests or two valleys.

Frequency Explained

• Frequency (f), represented by 'f', measures how many cycles occur per second, expressed in hertz (Hz).

• The period (T), which is inversely related to frequency, indicates how long it takes for one complete cycle. It’s measured in seconds.

High vs Low Frequencies

Characteristics of Frequencies

• Low frequencies correspond with fewer cycles reaching a certain point over time, producing lower sounds; high frequencies have more cycles within that same timeframe resulting in higher sounds.

Animal Perception of Sound Frequencies

• Different species perceive sound frequencies differently: humans hear 20 Hz - 20 kHz; dogs can detect 15 Hz - 50 kHz; cats up to 65 kHz; bats up to 210 kHz.

Wave Speed and Propagation

Understanding Wave Speed

• Wave speed refers to how fast a pulse propagates through a medium. It’s determined by measuring how far crests or valleys travel over time.

Mathematical Representation

• The formula for calculating wave speed (v): v = lambda/T , where λ is wavelength and T is period. This can also be expressed using frequency: v = lambda cdot f .

Impact of Medium Density on Wave Speed

Relationship Between Medium Density and Speed

• Less dense mediums allow waves to propagate faster than denser ones. For example, light travels fastest in vacuum compared to liquids or solids due to density differences.

Sound Frequency Perception

Human Hearing Range

• Humans typically perceive sound frequencies ranging from 20 Hz up to about 20 kHz; beyond this range becomes inaudible for most people but detectable by some animals.