Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 9

Reflection of Sound

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Topics

  • Force, Work, Power and Energy
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    • Force
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    • Moment (Turning Effect) of a Force Or Torque
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    • Principle of Moments
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  • Work, Energy and Power
  • Light
  • Sound
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    • Pulley
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  • Refraction of Light at Plane Surfaces
    • Refraction of Light
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    • Critical Angle
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    • Total Internal Reflection
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    • Use of a Total Internal Reflecting Prism in Place of a Plane Mirror
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  • Sound
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    • Reflection of Sound
    • Echoes
    • Determination of Speed of Sound by the Method of Echo
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  • Radioactivity
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    • Alpha Decay (Alpha Emission)
    • Beta Decay (Beta Emission)
    • Gamma Decay (Gamma Emission)
    • Uses of Radioactive Isotopes
    • Sources of Harmful Radiations
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    • Background Radiations
    • Nuclear Energy
    • Nuclear Fission
    • Distinction Between the Radioactive Decay and Nuclear Fission
    • Nuclear Fusion
    • Distinction Between the Nuclear Fission and Nuclear Fusion
  • Reflection of Sound
  • Reflection of sound in a different medium
  1. Reflection at the boundary of a denser medium
  2. Reflection at the boundary of a rarer medium
  3. Reflection of sound in the plane and curved surfaces

Notes

Reflection of sound:

Sound can bounce off a solid or a liquid. Some materials like metals and walls are called Good Reflectors of Sound as they do not absorb the sound while others like clothes and sponge are called Bad Reflectors of Sound as they absorb the sound easily.

Laws of reflection

There are two basic laws of reflection of sound:

(i) Angle of incidence is equal the angle of reflection.

(ii) The incident wave, the reflected wave and the normal all lie in the same plane.

Applications of Reflection of Sound

Notes

Uses of multiple reflection of sound:

  • Horns, trumpets, loudhailers or megaphones are designed in such a way that sound can travel in a particular direction only without spreading out everywhere. This makes it easier for the audience to listen to the speaker. All these instruments work on the phenomena of multiple reflections of sound.
  • Stethoscope is a medical instrument used for listening to sounds produced within the body, mainly in the heart or lungs. In stethoscopes the sound of the patient’s heartbeat reaches the doctor’s ears by multiple reflection of sound
  • Generally the ceilings of concert halls, conference halls and cinema halls are curved so that sound after reflection reaches all corners of the hall, Sometimes a curved soundboard may be placed behind the stage so that the sound, after reflecting from the sound board, spreads evenly across the width of the hall.
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