ICSE Class 10 Physics Chapter 7 Sound Revision Notes

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ICSE Class 10 Physics Chapter 7 Sound Revision Notes

 

Revision is very important for better conceptual understanding and securing good marks, and for Revision, Revision Notes are always considered the best. ICSE Class 10 Physics Chapter 7 Sound Revision Notes are one of the most important pieces of study material that students can receive, as it will aid them to study better and reduce the level of stress that students face during the hectic year

We, at Swiflearn, provide ICSE Class 10 Physics Chapter 7 Sound Revision Notes in an easy-to-understand, free downloadable PDF format for the students to frame a better understanding of the topic. Free ICSE Class 10 Physics Chapter 7 Sound Revision Notes provided here are prepared by Subject Matter Experts at Swiflearn in accordance with the latest ICSE Class 10 Syllabus and CISCE guidelines. These ICSE Class 10 Physics Chapter 7 Sound Revision Notes will definitely help students to save a lot of time during their examinations.

ICSE Class 10 Physics Chapter 7 Sound Revision Notes by Swiflearn are so far the best and most reliable Revision Notes for ICSE Class 10 Physics. These ICSE Class 10 Physics Chapter 7 Sound Revision Notes will surely increase your confidence and reduce the anxiety of examination. Students can download the FREE PDF of  ICSE Class 10 Physics Chapter 7 Sound Revision Notes, use it to clear all their doubts and queries, and hence excel in their examination.

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Sound

 

Reflection of Sound Waves – The bouncing back of the sound wave on striking a surface such as a wall, metal sheet, plywood, etc., is called the reflection of the sound wave.

Echo – The sound heard after reflection from a distant obstacle (such as a cliff, a hillside, etc.) after the original sound has ceased, is called an echo.

Reverberation – If the distance is less than 17 m, then the original sound mixes with the reflected sound. Due to repeated reflections at the reflecting surface, the sound gets prolonged. This effect is known as reverberation.

 

Elastic or mechanical waves:

  • The sound waves necessarily require a medium for their propagation
  • These waves travel in a medium through the vibrations of the medium particles about their mean positions
  • Hence, they are called elastic or mechanical waves

 

 

Types of Mechanical Waves

 

(i) Longitudinal waves:

  • The vibrations of medium particles are along the direction of propagation
  • Compressions and rarefactions are formed in the medium

(ii) Transverse waves:

  • The vibrations of medium particles are perpendicular to the direction of propagation
  • Crests and troughs are formed in the medium

 

 

Resonance

 

Resonance is a special case of forced vibrations. When the frequency of an externally applied periodic force on a body is equal to its natural frequency, the body starts vibrating with an increased amplitude. This phenomenon is called resonance and the vibrations of large amplitude are called resonant vibrations

 

Condition for resonance – Resonance occurs when the frequency of the applied force is exactly equal to the natural frequency of the vibrating body

 

Examples of resonance

  • Sympathetic vibrations of pendulums
  • Resonance in machine parts
  • Resonance in a stretched string and sound box of musical instruments and sonometer
  • Resonance in air column and tuning fork
  • Resonance in a bridge
  • Resonance in radio and TV receivers

 

Loudness

 

It is the property by virtue of which a loud sound can be distinguished from a faint one, both having the same pitch and frequency. Loudness is expressed in a unit called decibel (dB). It is directly proportional to the amplitude of vibration.

 

Intensity

 

The amount of sound energy passing each second through a unit area is called the intensity of sound.

 

Pitch

 

Pitch is that characteristic of sound by which an acute (or shrill) note can be distinguished from a grave or flat note. It is not the same as frequency. It refers to the sensation as perceived by the listener.

 

Quality / Timbre 

 

The quality or timbre of the sound is that characteristic which enables us to distinguish one sound from another having the same pitch and loudness, but emitted by two different instruments.

 

 

ICSE Class 10 Physics Chapter 7 Sound Revision Notes PDF

 

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