工作就用美篇工作版","guide_search_desc":"海量模板范文,一键做同款 工作就用美篇工作版","img_beautify_switch":0,"ad_free":0,"text_direction":1,"template":{},"container":{"id":2346795,"user_id":2385561,"container_id":3,"stick_article_id":"","cover_img_url":"","display_name":"浙教版科学七下","description":"","sort":1,"review_state":0,"ip":"","state":0,"create_time":1582472625},"redirect":{"redirect_type":1,"img_url":false,"link_url":"/wap/downloadpage/backpage","button_bg_color":false,"button_desc":false,"redirect_desc":false},"edit_date_str":"更新于 2020-10-20","current_time":1713937091,"font_name":"","rcmd_meipian":0,"hide_article_link":0,"from_wechat":false,"topk_keywords":[{"name":"红外线","score":0.20156},{"name":"月球","score":0.142522},{"name":"光年","score":0.140839},{"name":"三棱镜","score":0.138241},{"name":"色散","score":0.119388},{"name":"彩虹","score":0.112649},{"name":"地球","score":0.107387},{"name":"生命","score":0.104746},{"name":"父母","score":0.093484},{"name":"太阳光","score":0.090399}],"music_name":"","origin_status":0,"password_v2":"","font_id":0,"title_style":"{\"text_color\":{\"color\":\"#191919\",\"index\":0},\"text_size\":\"large\",\"text_style\":[\"bold\"]}","rich_text_title":"","enable_download":1,"cover_thumb":"http://static2.ivwen.com/users/2385561/92e1ce38146a26c51e8ef884a3a5896f.jpg-thumb2","has_video":true,"gift_switch":0,"enable_watermark":2,"content":{"article_id":213308510,"content":[{"audio_music_id":0,"img_height":482,"img_url":"https://ss2.meipian.me/users/2385561/351f3cda46ae89ac3073270830fc115f.jpg","img_width":592,"is_origin":false,"source":0,"text":"
一、复习强化
","type":1},{"audio_music_id":0,"img_height":249,"img_url":"https://ss2.meipian.me/users/2385561/2e6c8d1a86a6fc2ab3fed8ccb4ca4228.jpg","img_width":623,"is_origin":false,"source":0,"text":"光在空气中1s内传播的距离相当于绕地球7.5圈,光从月球传到地球只需1.3s。
光年是指光在一年内通过的距离。那么请问光年是时间单位还是什么单位呢?
请向父母描述。
父母判断正误
答:光年是指光在一年内通过的距离。所以光年是长度单位。
请你拿出纸和笔,请你计算一下光年到底有多大。算好后请交给父母检查。
父母判断正误
答:1光年 =365×24×3600×3×10^5干米= 9.46×10^12千米
(手机上指数输入只能用此符号:比如5的2次方:5^2 , 7的3次方:7^3)
【拓展】
","type":1},{"audio_music_id":0,"img_height":158,"img_url":"https://ss2.meipian.me/users/2385561/f7e03b86b110ca508792cb9264e33083.jpg","img_width":200,"is_origin":false,"source":0,"text":"圆形彩虹
","type":1},{"audio_music_id":0,"img_height":600,"img_url":"https://ss2.meipian.me/users/2385561/30d3acdba658cc6963a9ebe194161756.jpg","img_width":800,"is_origin":false,"source":0,"text":"太阳光穿过三棱镜可发生光的色散现象:在白屏上依次出现:红、橙、黄、绿、蓝、靛、紫七色光。
","type":1},{"audio_music_id":0,"img_height":476,"img_url":"https://ss2.meipian.me/users/2385561/bc4fe703f6cf22bbef8cb7f38b811341.jpg","img_width":606,"is_origin":false,"source":0,"type":1},{"audio_music_id":0,"img_height":272,"img_width":368,"is_origin":false,"source":0,"source_platform":"local","type":3,"video_length":3,"video_thumbnail":"http://static2.ivwen.com/users/2385561/1582112814672.jpg","video_url":"http://video.ivwen.com/users/2385561/1582112812904.mp4"},{"audio_music_id":0,"img_height":489,"img_url":"https://ss2.meipian.me/users/2385561/a13787b00527c02b3240e15b4d5252d6.jpg","img_width":807,"is_origin":false,"source":0,"text":"光的色散指的是复色光分解为单色光的现象。
这些是可见光,其实还有不可见光。
(三).物体的颜色
红、绿、蓝三种色光混合能够产生各种色彩,因此把 红、绿、蓝 三种色光叫做光的三原色。
","type":3,"video_length":107,"video_thumbnail":"http://static2.ivwen.com/users/2385561/1582461483053.jpg","video_url":"http://video.ivwen.com/users/2385561/1582461474252.mp4"},{"audio_music_id":0,"img_height":450,"img_url":"https://ss2.meipian.me/users/2385561/23fd475e4d8813e30b61f1c4a2830ab1.jpg","img_width":629,"is_origin":false,"source":0,"text":"四、看不见的光
(一)红外线(频率10^12 ~ 5×10^14赫)
1.概念:红光以外辐射的光线。
2.特性:红外线具有热效应。
物体的温度越高,辐射的红外线就越强。
太阳的热也有很大一部分是通过红外线的形式传送到地球的。
","type":1},{"audio_music_id":0,"img_height":425,"img_url":"https://ss2.meipian.me/users/2385561/8d53df175a310f53016d5c4191de8b26.jpg","img_width":636,"is_origin":false,"source":0,"text":" 不要以为神不知鬼不觉的放屁,红外线可是捕捉到\"彩虹屁\"!
","type":3,"video_length":71,"video_thumbnail":"http://static2.ivwen.com/users/2385561/1582514956105.jpg","video_url":"http://video.ivwen.com/users/2385561/1582514948752.mp4"},{"audio_music_id":0,"img_height":478,"img_url":"https://ss2.meipian.me/users/2385561/155799bc21001ab70aa71553e27749f2.jpg","img_width":631,"is_origin":false,"source":0,"text":"(二)紫外线(频率7.5×10^14 ~ 5×10^16赫)
1.概念:紫光以外辐射的光线。
2.特性:能杀死微生物,常用消毒灭菌。
适量照射紫外线有助于人体健康,但照射过量,会使皮肤变黑,诱发皮肤癌。
3.来源
自然界中的紫外线主要来源于太阳。臭氧层(20~25千米)吸收大部分来自太阳的紫外线。免受生物照射。
4.应用
","type":1},{"audio_music_id":0,"img_height":441,"img_url":"https://ss2.meipian.me/users/2385561/9a740fa8e2d4ebe71b3080dce9fe45b9.jpg","img_width":558,"is_origin":false,"source":0,"type":1},{"audio_music_id":0,"img_height":262,"img_width":320,"is_origin":false,"source":0,"source_platform":"local","type":3,"video_length":188,"video_thumbnail":"http://static2.ivwen.com/users/2385561/1582461692874.jpg","video_url":"http://video.ivwen.com/users/2385561/1582461677800.mp4"},{"audio_music_id":0,"img_height":488,"img_url":"https://ss2.meipian.me/users/2385561/e7eb0e9839839cb1cf01d0d5b876db6a.jpg","img_width":624,"is_origin":false,"source":0,"text":"1.在“五岳”之一泰山上,历史上曾多次出现 “佛光”奇景。据目击者说: “佛光”是一个巨大的五彩缤纷的光环,与常见的彩虹色彩完全一样。“佛光”形成的主要原因是---( )
A.直线传播 B.小孔成像
C.光的反射 D.光的色散
2.生命探测仪在地震救援中是搜索废墟下生命的“一双慧眼”。下列关于红外生命探测仪的工作原理的说法,正确的是-----------------( )
A.是利用DNA进行生命探测的
B.是通过感知温差进行生命探测的
C.是依靠声波进行生命探测的
D.是利用地磁场进行生命探测的
3.一台激光器朝着月球发射激光信号,经过2.7s后才接到从月球返回的信号,那么月球到地球的距离为---------( )
A.8.1×10^8 m B.4.05×10^5 km
C.8.1×10^5 m D.4.05×10^8 km
3、一台激光器朝着月球发射激光信号,经过2.7s后才接到从月球返回的信号,那么月球
到地球的距离为-------( )
A.8.1×10^8 m B.4.05×10^5 km
C.8.1×10^5 m D.4.05×10^8 km
5.1987 年,天文学家发现了一颗超新星,命名为1987A超新星。该星爆炸发生于被观察到之前大约1.63×10^5 年,也就是说它爆炸发出的光经过1.63×10^5 年才到达地球,则该星距地球约__________ 千米。
请拿出纸笔认真练习。
做好后请交给家长批改
家长按标准答案批改!
答案
1.D 2.B 3.B 4.D 5. 1.54×10^18
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","type":1},{"audio_music_id":0,"img_height":249,"img_url":"https://ss2.meipian.me/users/2385561/2e6c8d1a86a6fc2ab3fed8ccb4ca4228.jpg","img_width":623,"is_origin":false,"source":0,"text":"光在空气中1s内传播的距离相当于绕地球7.5圈,光从月球传到地球只需1.3s。
光年是指光在一年内通过的距离。那么请问光年是时间单位还是什么单位呢?
请向父母描述。
父母判断正误
答:光年是指光在一年内通过的距离。所以光年是长度单位。
请你拿出纸和笔,请你计算一下光年到底有多大。算好后请交给父母检查。
父母判断正误
答:1光年 =365×24×3600×3×10^5干米= 9.46×10^12千米
(手机上指数输入只能用此符号:比如5的2次方:5^2 , 7的3次方:7^3)
【拓展】
","type":1},{"audio_music_id":0,"img_height":158,"img_url":"https://ss2.meipian.me/users/2385561/f7e03b86b110ca508792cb9264e33083.jpg","img_width":200,"is_origin":false,"source":0,"text":"圆形彩虹
","type":1},{"audio_music_id":0,"img_height":600,"img_url":"https://ss2.meipian.me/users/2385561/30d3acdba658cc6963a9ebe194161756.jpg","img_width":800,"is_origin":false,"source":0,"text":"太阳光穿过三棱镜可发生光的色散现象:在白屏上依次出现:红、橙、黄、绿、蓝、靛、紫七色光。
","type":1},{"audio_music_id":0,"img_height":476,"img_url":"https://ss2.meipian.me/users/2385561/bc4fe703f6cf22bbef8cb7f38b811341.jpg","img_width":606,"is_origin":false,"source":0,"type":1},{"audio_music_id":0,"img_height":272,"img_width":368,"is_origin":false,"source":0,"source_platform":"local","type":3,"video_length":3,"video_thumbnail":"http://static2.ivwen.com/users/2385561/1582112814672.jpg","video_url":"http://video.ivwen.com/users/2385561/1582112812904.mp4"},{"audio_music_id":0,"img_height":489,"img_url":"https://ss2.meipian.me/users/2385561/a13787b00527c02b3240e15b4d5252d6.jpg","img_width":807,"is_origin":false,"source":0,"text":"光的色散指的是复色光分解为单色光的现象。
这些是可见光,其实还有不可见光。
(三).物体的颜色
红、绿、蓝三种色光混合能够产生各种色彩,因此把 红、绿、蓝 三种色光叫做光的三原色。
","type":3,"video_length":107,"video_thumbnail":"http://static2.ivwen.com/users/2385561/1582461483053.jpg","video_url":"http://video.ivwen.com/users/2385561/1582461474252.mp4"},{"audio_music_id":0,"img_height":450,"img_url":"https://ss2.meipian.me/users/2385561/23fd475e4d8813e30b61f1c4a2830ab1.jpg","img_width":629,"is_origin":false,"source":0,"text":"四、看不见的光
(一)红外线(频率10^12 ~ 5×10^14赫)
1.概念:红光以外辐射的光线。
2.特性:红外线具有热效应。
物体的温度越高,辐射的红外线就越强。
太阳的热也有很大一部分是通过红外线的形式传送到地球的。
","type":1},{"audio_music_id":0,"img_height":425,"img_url":"https://ss2.meipian.me/users/2385561/8d53df175a310f53016d5c4191de8b26.jpg","img_width":636,"is_origin":false,"source":0,"text":" 不要以为神不知鬼不觉的放屁,红外线可是捕捉到\"彩虹屁\"!
","type":3,"video_length":71,"video_thumbnail":"http://static2.ivwen.com/users/2385561/1582514956105.jpg","video_url":"http://video.ivwen.com/users/2385561/1582514948752.mp4"},{"audio_music_id":0,"img_height":478,"img_url":"https://ss2.meipian.me/users/2385561/155799bc21001ab70aa71553e27749f2.jpg","img_width":631,"is_origin":false,"source":0,"text":"(二)紫外线(频率7.5×10^14 ~ 5×10^16赫)
1.概念:紫光以外辐射的光线。
2.特性:能杀死微生物,常用消毒灭菌。
适量照射紫外线有助于人体健康,但照射过量,会使皮肤变黑,诱发皮肤癌。
3.来源
自然界中的紫外线主要来源于太阳。臭氧层(20~25千米)吸收大部分来自太阳的紫外线。免受生物照射。
4.应用
","type":1},{"audio_music_id":0,"img_height":441,"img_url":"https://ss2.meipian.me/users/2385561/9a740fa8e2d4ebe71b3080dce9fe45b9.jpg","img_width":558,"is_origin":false,"source":0,"type":1},{"audio_music_id":0,"img_height":262,"img_width":320,"is_origin":false,"source":0,"source_platform":"local","type":3,"video_length":188,"video_thumbnail":"http://static2.ivwen.com/users/2385561/1582461692874.jpg","video_url":"http://video.ivwen.com/users/2385561/1582461677800.mp4"},{"audio_music_id":0,"img_height":488,"img_url":"https://ss2.meipian.me/users/2385561/e7eb0e9839839cb1cf01d0d5b876db6a.jpg","img_width":624,"is_origin":false,"source":0,"text":"1.在“五岳”之一泰山上,历史上曾多次出现 “佛光”奇景。据目击者说: “佛光”是一个巨大的五彩缤纷的光环,与常见的彩虹色彩完全一样。“佛光”形成的主要原因是---( )
A.直线传播 B.小孔成像
C.光的反射 D.光的色散
2.生命探测仪在地震救援中是搜索废墟下生命的“一双慧眼”。下列关于红外生命探测仪的工作原理的说法,正确的是-----------------( )
A.是利用DNA进行生命探测的
B.是通过感知温差进行生命探测的
C.是依靠声波进行生命探测的
D.是利用地磁场进行生命探测的
3.一台激光器朝着月球发射激光信号,经过2.7s后才接到从月球返回的信号,那么月球到地球的距离为---------( )
A.8.1×10^8 m B.4.05×10^5 km
C.8.1×10^5 m D.4.05×10^8 km
3、一台激光器朝着月球发射激光信号,经过2.7s后才接到从月球返回的信号,那么月球
到地球的距离为-------( )
A.8.1×10^8 m B.4.05×10^5 km
C.8.1×10^5 m D.4.05×10^8 km
5.1987 年,天文学家发现了一颗超新星,命名为1987A超新星。该星爆炸发生于被观察到之前大约1.63×10^5 年,也就是说它爆炸发出的光经过1.63×10^5 年才到达地球,则该星距地球约__________ 千米。
请拿出纸笔认真练习。
做好后请交给家长批改
家长按标准答案批改!
答案
1.D 2.B 3.B 4.D 5. 1.54×10^18
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