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
58
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
Americancitiesare【C1】______otherdriesaroundtheworld.Ineverycountry,citiesreflectthe【C2】______oftheculture.Citi
Everyoneisfamiliarwiththecryofthedirectorwhoisabouttoshootasceneforanewmovie:"Quietontheset!"isthecomm
Howextraordinarilydifferent,again,aretheattitudesofdifferentpeopletotheirfellowmen!Oneman,inthecourseofalon
AccordingtotheU.N.FoodandAgriculturalOrganization,howmuchwillZimbabwe’scerealproductiondropfromlastyear?
Ourcountryistryingto______theseriousproblemscreatedbytheenvironmentpollution.
WhichofthefollowingstatementsisCORRECT?Attheendofthepassagetheauthorproposesmoreworkon
Whyisthemannotreallysurprisedthathisparentsaremoving?
Hisdeathwasattributed______byasnake.
随机试题
A.肋间隙B.肋脊角C.肋骨角D.肩胛下角E.脊柱棘突连线
肾为气之根与肾的哪项功能有关()
知觉是人脑对客观事物()
传染病暴发、流行时,当地政府不可以采取的紧急措施是
呈扁球形或圆锥形,断面可见棕色种皮与白色胚乳相间的大理石样花纹的药材是()。
《中华人民共和国矿产资源法》规定,关闭矿山,必须提出矿山闭坑报告及有关采掘工程、不安全隐患、土地复垦利用、(),并按照国家规定报请审查批准。
背景资料:某调水枢纽工程主要由泵站和节制闸组成,其中泵站设计流量为120m3/s,安装7台机组(含备用1台总装机容量为11900kW,年调水量为7.6×108m3,节制闸共5孔,单孔净宽8m,非汛期(含调水期)节制闸关闭挡水,汛期节制闸开敞泄洪
网络文件地址表示格式正确的是()。
行政诉讼当事人不服人民法院第一审裁定的,有权在裁定书送达之日起()日内提起上诉。
钟表的时针与分针在4点多少分第一次重合?
最新回复
(
0
)