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新概念英语青少版3A-11.ppt

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新概念英语青少版3A-11.ppt
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Unit 11,Turn it down,,,,,你对分贝了解多少?,分贝是以美国发明家亚历山大•格雷厄姆•贝尔命名的,他因发明电话而闻名于世。因为贝尔的单位太粗略而不能充分用来描述我们对声音的感觉,因此前面加了“分”字,代表十分之一。一贝尔等于十分贝。声学领域中,分贝的定义是声源功率与基准声功率比值的对数乘以10的数值。,按普通人的听觉 0 -2 0 分贝 很静、几乎感觉不到; 2 0 -4 0 分贝安静、犹如轻声絮语; 4 0 -6 0 分贝一般。普通室内谈话; 6 0 -7 0 分贝吵闹、有损神经; 7 0 -9 0 分贝很吵、神经细胞受到破坏; 9 0 -1 0 0 分贝 吵闹加剧、听力受损; 1 0 0 -1 2 0 分贝难以忍受、呆一分钟即暂时致聋; 120分贝以上:极度聋或全聋。一般声音在30分贝左右时,不会影响正常的生活和休息; 而达到50分贝以上时,人们又较大的感觉,很难入睡。,New words and Expressions,loud /laʊd/ adj.大声的,喧闹的 turn down v.+adv.把.关小,调低 interrupt /ˌɪntə'rʌpt/ v.打断 hearing /'hɪərɪŋ/ n.听觉 sound /saʊnd/ n.声音,响声 deaf /def/ adj.聋的 limit /'lɪmɪt/ n.限度,极限 decibel /ˈdesɪbel/ n.分贝(音量单位) continuous /kənˈtɪnjuəs/ adj.连续不断的,sudden /ˈsʌdn/ adj.突然的 damage /'dæmɪdʒ/ n.损害 nightclub /nait klʌb/ n.夜总会 MP3 player /'pleɪə/ n.MP3播放器 experience /ɪk'spɪərɪəns/ v.经历,体验 if /ɪf/ adv.conj.如果 unlucky /ʌn'lʌkɪ/ adj.不幸的,倒霉的 for ever /fər 'evə/ adv.永远 level /'levəl/ n.水平,LUCY: Dad,that music's loud!Turn it down! WILLIAM: Sorry,Lucy!Am I interrupting your homework?,,LUCY: It's not that,Dad.We had a lesson today about hearing.Look at this.,One person in seven in the UK is deaf,and many of them are deaf because of noise. For most people,the safe limit is 85 decibels(dB) for continuous noise,and 103 dB for sudden noise.After fifteen minutes at 105 dB,most people will have some damage to their hearing.,Music in nightclubs is ofen much louder than the safe limit.19% of young people listen to their MP3 players at 105 to 110 dB for many hours.75% of them will experience ‘ringing in the ears’,and they will fell a bit deaf.If they are lucky,this will last for one or two days.If they are unlucky,the damage will last for ever.,LUCY: You're always listening to loud music,Dad.If you aren't careful,you'll become deaf. WILLIAM: Sorry,Lucy!What did you say? LUCY: Oh,Dad!It isn't funny! WILLIAM: Of course it isn't.And I will turn the sound down.I promise!,HomeWork,1.words:三英一汉,音标一遍 2.text:背过 3.recording:课文录音每天十分钟,New words and Expressions,it
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