Nothing Special   »   [go: up one dir, main page]
Scribd Logo
Upload

Welcome to Scribd!

  • 124 views

    Chpater 15 Mechanical Waves

    Uploaded by

    cj
    This chapter discusses mechanical waves, including: 1) Earthquake waves carry enormous power while other mechanical waves like sound carry less energy. Mechanical waves interfere which helps explain musical instruments. 2) There are different types of mechanical waves including transverse, longitudinal, and surface waves. Mechanical waves require a source, medium, and mechanism for the medium's elements to influence each other. 3) Periodic waves involve repetitive motion. Properties like wavelength and speed can be described mathematically. Particle motion is perpendicular for transverse waves and parallel for longitudinal waves.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd

    Chpater 15 Mechanical Waves

    Uploaded by

    cj
    124 views4 pages
    This chapter discusses mechanical waves, including: 1) Earthquake waves carry enormous power while other mechanical waves like sound carry less energy. Mechanical waves interfere which helps explain musical instruments. 2) There are different types of mechanical waves including transverse, longitudinal, and surface waves. Mechanical waves require a source, medium, and mechanism for the medium's elements to influence each other. 3) Periodic waves involve repetitive motion. Properties like wavelength and speed can be described mathematically. Particle motion is perpendicular for transverse waves and parallel for longitudinal waves.

    Original Description:

    Original Title

    chpater 15 mechanical waves (1)

    Copyright

    © © All Rights Reserved

    Available Formats

    DOCX, PDF, TXT or read online from Scribd

    Did you find this document useful?

    Is this content inappropriate?

    This chapter discusses mechanical waves, including: 1) Earthquake waves carry enormous power while other mechanical waves like sound carry less energy. Mechanical waves interfere which helps explain musical instruments. 2) There are different types of mechanical waves including transverse, longitudinal, and surface waves. Mechanical waves require a source, medium, and mechanism for the medium's elements to influence each other. 3) Periodic waves involve repetitive motion. Properties like wavelength and speed can be described mathematically. Particle motion is perpendicular for transverse waves and parallel for longitudinal waves.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    124 views4 pages

    Chpater 15 Mechanical Waves

    Uploaded by

    cj
    This chapter discusses mechanical waves, including: 1) Earthquake waves carry enormous power while other mechanical waves like sound carry less energy. Mechanical waves interfere which helps explain musical instruments. 2) There are different types of mechanical waves including transverse, longitudinal, and surface waves. Mechanical waves require a source, medium, and mechanism for the medium's elements to influence each other. 3) Periodic waves involve repetitive motion. Properties like wavelength and speed can be described mathematically. Particle motion is perpendicular for transverse waves and parallel for longitudinal waves.

    Copyright:

    © All Rights Reserved
    Download as DOCX, PDF, TXT or read online from Scribd
    Download as docx, pdf, or txt
    of 4

    Chapter 15: Mechanical

    Waves

     Earthquake waves
    carry enormous
    power as they travel
    through the earth.
     Other types of
    mechanical waves,
    such as sound waves
    or the vibration of the
    strings of a piano, carry far less energy.
     Overlapping waves interfere, which helps us understand musical instruments.

    15.1. Types of Mechanical Waves

     Mechanical Wave - a disturbance traveling through a medium


     Transverse Waves - displacement of the medium are perpendicular to the direction of travel of
    the wave
     Longitudinal Waves - displacement of the medium are parallel to the direction of the wave
    travel; time the motions of the particles of the medium are back and forth along the same
    direction that the wave travels
     Surface Waves/ Complex Waves - dsiplacement of water have both longitudinal and transverse
    components, ended up moving in a circle
     Wave speed/ speed of propagation - definite speed in which a wave travels or propagate
    through a medium

    Mechanical Waves Requirements

     Some source of disturbance


     A medium containing elements that can be disturbed
    Some physical mechanism through which elements of the medium can influence each other

    15.2. Periodic Waves - wave propagation is in repetitive or periodic motion

     For a periodic wave, each particle of the medium undergoes periodic motion.
     The wavelength, λ, of a periodic wave is the length of one complete wave pattern.
     The speed of any periodic wave of frequency f is v = λf

    Periodic Transverse Waves

     The particles move up and down, but the wave moves to the right.
     Wave that results is a symmetrical sequence of crests and troughs.
     Sinusoidal Waves - periodic waves with simple harmonic motion
     When a sinusoidal wave passes through a medium, every particle in the medium undergoes

    simple harmonic motion with the same frequency

     Wave Motion is the movement of wave with constant speed along the length of the string,
    while Particle Motion is simple harmonic and transverse (perpendicular) to the length of the
    string.

    Periodic Longitudinal Waves

     Particles oscillate back and forth along the same direction that the wave moves
     SHM of longitudinal wave forms regions in the fluid where the pressure and density are greater
    or less than the equilibrium values. Compressions are region of inceased density while
    Rarefactions are regions of decreased density.
     Each particle in the fluid oscillates in SHM parallel to the direction of wave propagation with the
    same amplitude A and
    period T

    15.3. Mathematical
    Description of Wave

     The wave
    function, y(x,t), gives a
    mathematical description
    of a wave. In this
    function, y is the
    displacement of a particle at time t and position x.
     Phase differences - differences in cyclic motions of various points on the string are out of step
    with each other by various fractions of a cycle.
     The wave function for a sinusoidal wave moving in the +x-direction are:
     where k = 2π/λ is called the wave number
     (kx ± ωt) called the phase, plays the role of an angular quantity (always measured in radians)

    Particle Velocity and Acceleration

    15.4. Speed of a
    Transverse Wave

     Speed of
    transverse
    waves is

    affected by tension in the string and its mass per unit length (also called linear mass density).

    Tension
    F = mg
     Speed of Mechanical Waves
    15.5. Energy in Wave Motion

    Power in Wave Motion (maximum)

    Power in Wave Motion (average)

    Wave Intensity

     time average rate at which energy is transported by the wave, per unit area

     The intensity I at any distance r is therefore inversely proportional to r².This relationship is called
    the inverse-square law for intensity.

    15.6 Wave Interference, Boundary Conditions, and Superposition

    You might also like