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21 Δεκ 2020 · 8. HOW SOUND PROPAGATE IN A MEDIUM? • Sound needs some vibration of molecules to travel. • Solids, liquids and gases all have molecules present in them which allow the propagation of sound. • These molecules or particles in solids, liquids and gases are packed in varied ways.
- class 8 sound
This document is a lesson plan on sound for class 8...
- class 8 sound
28 Ιουλ 2019 · Grade 8 - Module 5: Sounds. Jul 27, 2019 • Download as PPTX, PDF •. 47 likes • 47,885 views. Van Linz Castillo. Follow. Sound is produced when a matter vibrates. Sounds consists waves and these waves travel as a longitudinal waves. Sound travels fastest in solids because the particles are closer.
28 Απρ 2021 · This document is a lesson plan on sound for class 8 students. It covers topics like the production of sound through vibration, how different musical instruments produce sound, the parts of the human ear and how we hear sound, reflection and reverberation of sound waves, infrasonic and ultrasonic sounds, noise pollution and its effects.
Sound waves that the average human ear can hear, called audible sound waves, have frequencies between 20 and Hz. Sound waves with frequencies less than 20 Hz are called infrasonic waves. Sound waves with frequencies above Hz are called ultrasonic waves.
This document discusses sound and how it travels through different mediums. It explains that sound is caused by vibration that travels through a medium as a mechanical wave. The speed of sound varies in different mediums, being fastest in solids and slower in liquids and gases.
Sound waves transfer energy through a medium by compressions and rarefactions rather than transferring particles. The characteristics of sound waves include frequency, wavelength, amplitude and pitch, with pitch varying based on frequency and amplitude determining loudness.
The document describes characteristics of sound and how organisms produce, transmit, and receive sound of various frequencies. It discusses that students will be able to describe sound characteristics and identify how organisms produce sound through vibration of various parts.
