××牌94厘米液晶彩色電視機(jī)
額定電壓220V
頻率50Hz
功率200W
表所示是小紅家電視機(jī)的銘牌,該電視機(jī)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(lán)、    、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(jī)銘牌上參數(shù)的含義.
電視機(jī)彩色畫面是由光的三原色紅、綠、藍(lán)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(jī)銘牌上220V表示電視機(jī)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(lán)合成.
兩會盛況是通過衛(wèi)星通信來轉(zhuǎn)播的,太空中是真空,聲波不能在真空中傳播,衛(wèi)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(jī)來考查了聲、光、電三部分內(nèi)容,跨越比較大,但是知識點是比較簡單的.
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