Ch 14 - Waves11th Physics
Nature of Wave Motion
What physically travels through a medium when a mechanical wave propagates, and does the medium itself fundamentally flow?
What physically travels through a medium when a mechanical wave propagates, and does the medium itself fundamentally flow?
Wave Propagation
- A wave is a vibratory disturbance that propagates through a material medium.
- It strictly transports Energy and Momentum from one point to another.
- Crucial Note: There is absolutely no actual bulk transfer or flow of matter. The particles of the medium merely oscillate locally about their mean equilibrium positions.
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Classification of Waves by Medium
How are waves broadly classified based on their absolute requirement for a material medium to propagate?
How are waves broadly classified based on their absolute requirement for a material medium to propagate?
Three Broad Categories:
- Mechanical Waves: Require a material medium (solid, liquid, or gas) governed by Newton's laws. (Examples: Sound waves, Water waves, Seismic waves).
- Electromagnetic (EM) Waves: Do not require any material medium; they can travel through a perfect vacuum. (Examples: Light, X-rays, Radio waves).
- Matter Waves: Associated with fundamental moving particles (electrons, protons) as described by quantum mechanics.
Prism Memory Hook
MEM: Mechanical (Medium), Electromagnetic (Empty space), Matter (Massive particles).
Transverse vs. Longitudinal Waves
Fundamentally, how does the particle motion differ with respect to the direction of wave propagation in Transverse versus Longitudinal waves?
Fundamentally, how does the particle motion differ with respect to the direction of wave propagation in Transverse versus Longitudinal waves?
The Distinction
- Transverse Waves: The constituent particles of the medium oscillate perpendicular (at right angles) to the direction of wave propagation. They travel as alternating Crests and Troughs.
- Longitudinal Waves: The constituent particles of the medium oscillate parallel (along the same line) to the direction of wave propagation. They travel as alternating Compressions and Rarefactions.
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Also in this chapter
44 more cards to study in Prism
- 4Propagation Media Constraints
- 5Progressive Harmonic Wave Equation
- 6Angular Wave Number ($k$)
- 7Speed of a Travelling Wave ($v$)
- 8Speed of Transverse Wave on a Stretched String
- 9Speed of Longitudinal (Sound) Wave
- 10Laplace's Correction
- 11Equation of a Stationary Wave
- 12Newton's Formula for Speed of Sound
- 13Normal Modes of a Stretched String
- 14Frequencies of a Closed Organ Pipe
- 15Factors Affecting Speed of Sound
- 16Frequencies of an Open Organ Pipe
- 17Principle of Superposition of Waves
- 18Reflection of Waves: Rigid vs. Free Boundary
- 19Standing (Stationary) Waves
- 20Beat Frequency Formulation
- 21General Doppler Effect Formula
- 22Melde's Experiment
- 23Particle Velocity vs. Wave Velocity
- 24Differential Wave Equation
- 25Maximum Particle Velocity & Acceleration
- 26Closed vs. Open Organ Pipes (Musicality)
- 27Resultant Intensity (Wave Interference)
- 28End Correction in Organ Pipes
- 29Acoustic Resonance in Stringed Instruments
- 30Node and Antinode Spatial Geometry
- 31Phenomenon of Beats
- 32Doppler Effect (Accounting for Wind)
- 33The Doppler Effect in Sound
- 34Pressure Wave vs. Displacement Wave
- 35Resonance Column Experiment
- 36Transverse Doppler Effect (Sound)
- 37Average Power Transmitted by a Wave
- 38Asymmetry of Doppler Effect in Sound
- 39Phase, Path, and Time Difference
- 40Characteristics of Musical Sound
- 41Relativistic Doppler Effect (Light)
- 42Conditions for an Echo
- 43Application of Ultrasonic Waves (SONAR)
- 44Supersonic Speed & Shock Waves
- 45Polarization Limit of Sound Waves
- 46Water Surface Waves (Capillary vs. Gravity)
- 47Did You Know: Musical Pillars
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