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
2023-11-10
43
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:https://tihaiku.com/zcyy/3174203.html
相关试题推荐
TheissueconcerningwhocontrolstheInternetwillbediscussed[originaltext]
What’sthemostseriousproblemAfricannationsarefacing?[br][originaltext]
Whichofthefollowingstatementsistrue?[originaltext]Abouthalfofthe
Accordingtothenews,whywastheBrazilianmankilled?[br][originaltext]
Welearnfromthepassagethatthepredictioncomefrom[br][originaltext]
Welearnfromthepassagethatthepredictioncomefrom[br][originaltext]
Welearnfromthepassagethatthepredictioncomefrom[br][originaltext]
Whatisthefocusofthepassage?[br][originaltext]Scientistshavediscov
Whatisthefocusofthepassage?[br][originaltext]Scientistshavediscov
WhichofthefollowingisNOTthesymptomofthewoman?[br][originaltext]M:H
随机试题
[img]2020m5s/ct_ve01402002m_etoeicryd_0424_202005[/img][br]Whatisadvertised
[originaltext]Forseveralyears,humanresourcesdirectorPeteTapaskarsay
3岁小儿,体温38℃,有结膜炎,发热后1天出疹,由面部开始,1天后遍布全身,3天
A. B. C. D.
以下哪项不属于创业板市场的功能()。A.投机活动 B.承担风险资本的退出窗
胃大部切除术,切口有血肿A.切口分类及愈合记录为“I/甲” B.切口分类及愈合
主刑既可以单独适用,也可以附加适用( )
(2019年真题)根据《标准施工招标文件》的施工合同文本通用合同条款,可以同时给
男,35岁。左上腹被拖拉机撞伤后钝痛1天,突发左上腹剧痛3小时。查体:P140
最新回复
(
0
)