首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Why were early radio broadcasts heard by such a small audience?
Why were early radio broadcasts heard by such a small audience?
admin
2010-02-17
90
问题
Why were early radio broadcasts heard by such a small audience?
It was an Italian inventor who created the first wireless device for setting out radio signals in 1895. But not until the American inventor Lee De Forest built the first amplifying vacuum tube in 1906 did we get the first radio as we know it. And the first actual radio broadcast was made on Christmas Eve of 1906. That’s when someone working from an experimental station in Brand Rock, Massachusetts, arranged the program with two short musical selections of poem and brief holiday greeting. The broadcast was heard by wireless operators on ships with a radio through several hundreds miles. The following year, De Forest began regular radio broadcasts in New York. These programs Were similar to much what we hear on radio today. In that, De Forest played only music. But because there were still no home radio receivers, De Forest’s audiences consisted only of wireless operators on ships in New York Harbor. There is no doubt that radio broadcasting was quite a novelty in those days, but it took a while to catch on commercially. Why? Hmm, for the simple fact that only a few people, in fact, only those who tinkered with wireless telegraphs as a hobby owned receivers. It wasn’t until the 1920s that someone envisioned mass appeal for radio. This was radio pioneer David Sarnoff who predicted that one day there would be a radio receiver in every home.
选项
A、Military communications officers.
B、People who treated radio technology as a hobby.
C、People who lived in big cities.
D、People with an interest in music.
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/SB9K777K
0
专业英语四级
相关试题推荐
Tomanyweb-buildingspiders,mostof【C1】______arenearlyblind,thewebistheiressentialwindow【C2】______theworld.,their
Tomanyweb-buildingspiders,mostof【C1】______arenearlyblind,thewebistheiressentialwindow【C2】______theworld.,their
Wheredoesthisconversationmostlikelytakeplace?
Duringthefamine,thecouplemade______onhalfaloafofbreadandsomeleavesforthreemonths.
Justasthetrendsofthe1980sweredifficulttopredict,so,too,aretheforcesthatwilldrivetheindustryinthe1990s.Bu
Studiesshowthatmostadoptedchildrenwanttoknowwhotheir_________parentsare.
Hecannot______aear,forhedoesnotearnmuchmoney.
Ofallthingsintheworld,Imostdislikefillingupforms;infact,Ihaveapositivehorrorofit.Applyingforadrivinglic
Nutritionist’sAdviceEatingcorrectlyinyour20sand30scanbeamatterofvisualaesthetics,ratherthanatiresomeexe
随机试题
根据特殊需要,上级单位亲自调查收集或要求下级单位尽力去收集资料。称之为下级单位常向上级机构上报监测数据和资料,而上级单位被动接收。称之为
在编制预算时,干式变压器如果带有保护外罩时,其安装定额中的人工和机械都乘以系数()。
纳税人不进行纳税申报,不缴或者少缴应纳税款的,由税务机关追缴其不缴或者少缴的税款,滞纳金,并处不缴或者少缴的税款()的罚款。
下列税种中,征税对象与计税依据一致的是( )。
道教建筑中,()以外属于俗界,以内属于仙界。
一位橄榄球教练这样教导他的队员:“橄榄球比赛里,从来是以结果论英雄。在球场上,不是赢家就是输家;在球迷眼里,赢的就是勇者,输的就是弱者。”由于所有的赢家都是勇者,每一个输家都是弱者。以下选项最有力支持教练观点的是()。
SharepricesontheStockExchangeplungedsharplyinthemorningbut______slightlyintheafternoon.
下面关于采用总线结构在系统设计、生产、使用和维护方面的优越性的叙述中,描述不正确的是( )。
HowmuchwillLenovopayincashtopurchaseIBM?
Includingafewbitesofmeatinthedietsofpoorchildrenfromdevelopingcountriesimprovesboththeirhealthandtheirperfo
最新回复
(
0
)