{"id":153583,"date":"2024-01-04T14:49:40","date_gmt":"2024-01-04T09:19:40","guid":{"rendered":"https:\/\/icsesolutions.com\/?p=153583"},"modified":"2024-01-05T09:49:15","modified_gmt":"2024-01-05T04:19:15","slug":"icse-class-8-physics-notes-chapter-7","status":"publish","type":"post","link":"https:\/\/icsesolutions.com\/icse-class-8-physics-notes-chapter-7\/","title":{"rendered":"ICSE Class 8 Physics Notes Chapter 7 Sound"},"content":{"rendered":"<h2>ICSE Physics Class 8 Notes Chapter 7 Sound<\/h2>\n<p>\u2192 SOUND : \u201cIs energy which produces in us the sensation of hearing.\u201d It is produced by vibration of body.<\/p>\n<p>\u2192 Sound needs a medium for its propagation. Sound cannot travel in vacuum.<\/p>\n<p>\u2192 Speed of sound is maximum in solids. 5000 m s<sup>-1<\/sup> in steel, in water 1500 m s<sup>-1<\/sup> and in air it is least 330 m s<sup>-1<\/sup> nearly.<\/p>\n<p>\u2192 When a body vibrates, the particles of medium also start vibrating and K.E. of particles changes into potential energy and P.E. into K.E. This is why sound in energy.<\/p>\n<p>\u2192 Sound travels in a medium in the form of wave.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-153585\" src=\"https:\/\/i0.wp.com\/icsesolutions.com\/wp-content\/uploads\/2021\/04\/ICSE-Class-8-Physics-Notes-Chapter-7-Sound-1.png?resize=361%2C52&#038;ssl=1\" alt=\"ICSE Class 8 Physics Notes Chapter 7 Sound - 1\" width=\"361\" height=\"52\" srcset=\"https:\/\/i0.wp.com\/icsesolutions.com\/wp-content\/uploads\/2021\/04\/ICSE-Class-8-Physics-Notes-Chapter-7-Sound-1.png?w=361&amp;ssl=1 361w, https:\/\/i0.wp.com\/icsesolutions.com\/wp-content\/uploads\/2021\/04\/ICSE-Class-8-Physics-Notes-Chapter-7-Sound-1.png?resize=300%2C43&amp;ssl=1 300w\" sizes=\"(max-width: 361px) 100vw, 361px\" data-recalc-dims=\"1\" \/><\/p>\n<p>\u2192 Longitudinal wave: When the particles of medium move in the direction of motion of wave by forming compression and rarefaction.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-153586\" src=\"https:\/\/i1.wp.com\/icsesolutions.com\/wp-content\/uploads\/2021\/04\/ICSE-Class-8-Physics-Notes-Chapter-7-Sound-2.png?resize=404%2C90&#038;ssl=1\" alt=\"ICSE Class 8 Physics Notes Chapter 7 Sound - 2\" width=\"404\" height=\"90\" srcset=\"https:\/\/i1.wp.com\/icsesolutions.com\/wp-content\/uploads\/2021\/04\/ICSE-Class-8-Physics-Notes-Chapter-7-Sound-2.png?w=404&amp;ssl=1 404w, https:\/\/i1.wp.com\/icsesolutions.com\/wp-content\/uploads\/2021\/04\/ICSE-Class-8-Physics-Notes-Chapter-7-Sound-2.png?resize=300%2C67&amp;ssl=1 300w\" sizes=\"(max-width: 404px) 100vw, 404px\" data-recalc-dims=\"1\" \/><\/p>\n<p>AMPLITUDE : \u201cThe maximum displacement of the particle of medium on either side of mean position.\u201d<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-153587\" src=\"https:\/\/i0.wp.com\/icsesolutions.com\/wp-content\/uploads\/2021\/04\/ICSE-Class-8-Physics-Notes-Chapter-7-Sound-3.png?resize=264%2C86&#038;ssl=1\" alt=\"ICSE Class 8 Physics Notes Chapter 7 Sound - 3\" width=\"264\" height=\"86\" data-recalc-dims=\"1\" \/><\/p>\n<p>TIME PERIOD : \u201cThe time taken by a particle of medium to complete its one vibration\u2019 &#8216;t\u2019.<\/p>\n<p>FREQUENCY : \u201cThe number of vibrations made by a particle of the medium in one second.\u201d<br \/>\nf measured in Hertz (Hz)<\/p>\n<p>FREQUENCY : f = \\(\\frac {1}{t}\\) or t = \\(\\frac {1}{f}\\)<\/p>\n<p>WAVE LENGTH : \u201cThe distance travelled by the wave in one one time period of vibration of particle of medium.\u201d<br \/>\nOr<br \/>\n\u201cThe distance between two consecutive compressions or between two consecutive rarefactions.\u201d It is denoted by \u2018 \u03bb \u2019 and S.I. unit of wave length is metre (m).<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-153588\" src=\"https:\/\/i0.wp.com\/icsesolutions.com\/wp-content\/uploads\/2021\/04\/ICSE-Class-8-Physics-Notes-Chapter-7-Sound-4.png?resize=377%2C92&#038;ssl=1\" alt=\"ICSE Class 8 Physics Notes Chapter 7 Sound - 4\" width=\"377\" height=\"92\" srcset=\"https:\/\/i0.wp.com\/icsesolutions.com\/wp-content\/uploads\/2021\/04\/ICSE-Class-8-Physics-Notes-Chapter-7-Sound-4.png?w=377&amp;ssl=1 377w, https:\/\/i0.wp.com\/icsesolutions.com\/wp-content\/uploads\/2021\/04\/ICSE-Class-8-Physics-Notes-Chapter-7-Sound-4.png?resize=300%2C73&amp;ssl=1 300w\" sizes=\"(max-width: 377px) 100vw, 377px\" data-recalc-dims=\"1\" \/><\/p>\n<p>CHARACTERISTICS OF SOUND :<\/p>\n<ul>\n<li>Loudness.<\/li>\n<li>Pitch (or shrillness).<\/li>\n<li>Quality (or timbre or wave form).<\/li>\n<\/ul>\n<p>LOUDNESS : is the characteristic of sound by virtue of which a loud sound can be distinguished from a faint sound, both having same frequency and same wave form.<\/p>\n<p>It depend on: (i) Amplitude of wave (ii) Surface area of vibrating body (ii) Distance from the source of sound (iv) Sensitivity of listener: Unit of loudness is (dB) decibel.<\/p>\n<p>PITCH : It depends on number of vibrations per second or frequency: more frequency is high pitch shrilled sound and low frequency is flat sound.<\/p>\n<p>QUALITY : is the characteristic which distinguishes two sounds of the same pitch and same loudness. It depends on wave form.<\/p>\n<p><a href=\"https:\/\/icsesolutions.com\/icse-class-8-physics-notes\/\">ICSE Class 8 Physics Notes<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>ICSE Physics Class 8 Notes Chapter 7 Sound \u2192 SOUND : \u201cIs energy which produces in us the sensation of hearing.\u201d It is produced by vibration of body. \u2192 Sound needs a medium for its propagation. Sound cannot travel in vacuum. \u2192 Speed of sound is maximum in solids. 5000 m s-1 in steel, in &hellip;<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[3034],"tags":[],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/posts\/153583"}],"collection":[{"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/comments?post=153583"}],"version-history":[{"count":1,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/posts\/153583\/revisions"}],"predecessor-version":[{"id":165575,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/posts\/153583\/revisions\/165575"}],"wp:attachment":[{"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/media?parent=153583"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/categories?post=153583"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/icsesolutions.com\/wp-json\/wp\/v2\/tags?post=153583"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}