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精英家教網 > 初中物理 > 題目詳情
××牌94厘米液晶彩色電視機
額定電壓220V
頻率50Hz
功率200W
表所示是小紅家電視機的銘牌,該電視機正常工作時的電壓為    伏,功率是    瓦,電視畫面中的多彩顏色是由藍、    、紅三種色光組成.2011年3月召開的兩會盛況電視報道是通過    向全世界傳播的.(選填“聲波”或“無線電波”)
【答案】分析:掌握電視機銘牌上參數的含義.
電視機彩色畫面是由光的三原色紅、綠、藍合成的.
聲不能在真空中傳播,電磁波可以在真空中傳播.
解答:解:電視機銘牌上220V表示電視機正常工作電壓是220V,額定功率是200W.
電視畫面由光的三原色紅、綠、藍合成.
兩會盛況是通過衛星通信來轉播的,太空中是真空,聲波不能在真空中傳播,衛星通信依靠電磁波傳遞信息.無線電波是一種電磁波.
故答案為:220;200;綠;無線電波.
點評:本題通過電視機來考查了聲、光、電三部分內容,跨越比較大,但是知識點是比較簡單的.
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