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
102
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
Howmanyattacksandclasheswerereportedinthisnews?
Thelittlegirlcouldnot______hertearswhenhermotherwasdressingthewound.
WhatisthepercentageofcollegegraduatesgettingjobsthroughuniversityCareersService?
Studiesshowthatmostadoptedchildrenwanttoknowwhotheir_________parentsare.
Amajorreasonforconflictintheanimalworldisterritory.Themaleanimal【C1】______anarea.Thesizeoftheareais【C2】____
Ascientificdiscoveryisoftenmade【C1】______beforesomeoneisabletoputittouse.【C2】______,scientistsdiscoveredhowto
Whywereearlyradiobroadcastsheardbysuchasmallaudience?
Commoncoldisaviralinfectionthatstartsintheupperrespiratorytract,sometimesspreadstothelowerstructures,andmay
Commoncoldisaviralinfectionthatstartsintheupperrespiratorytract,sometimesspreadstothelowerstructures,andmay
Themourningperiodstartsfrom______.
随机试题
关于主动性异位心律,下列哪项不正确
根据国务院《医疗事故处理条例》的规定不属于医疗事故的情况是
一健康小儿会翻身,能笑出声,能抓面前物体,但尚不能认识熟人和陌生人,其年龄可能是:
设定行政许可,应当规定的内容包括( )。
适宜于扑救600V下带电电器、贵重设备、图书档案、精密仪器仪表的初起火灾,以及一般可燃液体的火灾的灭火器是()。
行政强制措施:指行政机关在行政管理过程中,为制止违法行为、防止证据销毁、避免危害发生、控制危险扩大等情形,依法对公民的人身自由实施暂时性限制,或者对公民、法人或者其他组织的财物实施暂时性控制的行为。根据上述定义,下列属于行政强制措施的是()。
某办公室5人中有2人精通德语。如从中任意选出3人,其中恰有1人精通德语的概率是多少?()
研究假设就是对研究结果的推测和假定。
CompletetheregistrationformusingNOMORETHANTHREEWORDS.Nameofstudent:【T6】______Address:【T7】Flat5/______.Town:【T8】
Duringthewholeofadark,cloudydayneartheendoftheyearIhadbeen【C1】______myhorsealongcountryroadswithlittleli
最新回复
(
0
)