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7. Sound

Sound is a form of energy produced by vibrating objects and requires a material medium for propagation. It travels faster in solids than in liquids, and faster in liquids than in gases. Key concepts such as wavelengths, frequency, amplitude, and the speed of sound are explored, along with the phenomena of reflection (echo) and reverberation. The chapter concludes with various applications of sound, including sonar and medical imaging.

Sections

  • 7

    Sound

    Sound is a form of energy created by vibrating objects and requires a medium to travel.

    Learning Practice

  • 7.1

    Introduction To Sound

    Sound is energy created by vibrating objects and requires a medium for propagation, but cannot travel through a vacuum.

    Learning Practice

  • 7.2

    Nature Of Sound Waves

    Sound waves are mechanical longitudinal waves characterized by the parallel vibration of particles relative to the direction of wave propagation.

    Learning Practice

  • 7.3

    Propagation Of Sound

    Sound requires a medium to travel, with varying speeds in different materials.

    Learning

  • 7.4

    Characteristics Of Sound Waves

    This section discusses the essential characteristics of sound waves, including wavelength, frequency, amplitude, time period, and speed.

    Learning Practice

  • 7.5

    Audible And Inaudible Sounds

    This section discusses the range of sound frequencies audible to humans and distinguishes between audible sounds and those that are inaudible, such as infrasonic and ultrasonic sounds.

    Learning Practice

  • 7.6

    Reflection Of Sound (Echo)

    This section explains how sound can reflect off surfaces, creating an echo, and the conditions necessary for an echo to be heard.

    Learning Practice

  • 7.7

    Reverberation

    Reverberation is the persistence of sound caused by repeated reflections.

    Learning Practice

  • 7.8

    Applications Of Sound

    This section discusses various practical applications of sound, including sonar, medical imaging, cleaning, and communication.

    Learning Practice

References

p9-7.pdf

Class Notes

Memorization

What we have learnt

  • Sound is produced by vibrat...
  • Sound waves are mechanical ...
  • There are audible and inaud...

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