首页
登录
职称英语
Why were early radio broadcasts heard by such a small audience? [br] [originalt
Why were early radio broadcasts heard by such a small audience? [br] [originalt
游客
2023-11-20
54
管理
问题
Why were early radio broadcasts heard by such a small audience? [br]
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、They would get smaller in size.
B、Their signals would travel further.
C、They would become less popular than television.
D、They would be common household items.
答案
D
解析
转载请注明原文地址:http://tihaiku.com/zcyy/3204020.html
相关试题推荐
Howmanyattacksandclasheswerereportedinthisnews?[br][originaltext]
Howmanyattacksandclasheswerereportedinthisnews?[originaltext]Atta
WhatdoesthenewssayaboutthepresidentialelectioninIndonesia?[originalte
WhichofthefollowingisNOTtrueabouttheAUpeacekeepingforce?[originaltex
Wheredoesthisconversationmostlikelytakeplace?[br][originaltext]M:Hell
Whatisthemaintopicofthisconversation?[br][originaltext]M:Weseemtob
Whatisthemaintopicofthisconversation?[br][originaltext]M:Weseemtob
[originaltext]LetChildrenLearntoJudgeTheirOwn
______werereportedbytheweatherstationinChicago.[originaltext]Onthe
Howmanycarsaretowedfromthestreetseachyear?[br][originaltext]One
随机试题
Excusesrepresentadesiretohangontothelifeyouhavenow.Anexcuseis
运用全息成像、人工智能、数字视觉设计、虚拟现实等技术展示虚拟形象进行营业性演出的
心绞痛疼痛的典型部位,在A.心尖区 B.心前区 C.胸骨体下段之胸骨后 D
婴幼儿心脏按压的频率至少为A.60次/分 B.80次/分 C.100次/分
最常见的胸部损伤是A.肋骨骨折 B.开放性气胸 C.张力性气胸 D.血胸
对有便血,排便习惯改变的人首选的、简便又十分重要的检查是A.直肠指诊 B.乙状
某省级高速公路已列为该省重点交通项目,高速公路选址穿过国有林场、纳入河道管理的河
社会工作者在社区开展活动时需要得到所在机构的支持,因此要对自己的机构有一定的认识
如图5-29所示梁的受载情况对于中央截面C为反对称。FSC和MC分别表示中央截面
急性炎症性脱髓鞘性多发性神经病最大的危险是A.心肌炎 B.呼吸肌麻痹 C.心
最新回复
(
0
)