首页
登录
职称英语
[audioFiles]audio_ezf_m_0275(20101)[/audioFiles] Light travels at a speed w
[audioFiles]audio_ezf_m_0275(20101)[/audioFiles] Light travels at a speed w
游客
2023-11-22
53
管理
问题
选项
答案
Light travels at a speed which is about a million times faster than the speed of sound. In one second, light travels about 300,000 km, but sound travels only 0. 334 kin. You can get some idea of this difference by watching the start of a race. If you stand some distance away from the starter, you can see smoke come from the referee’s gun before the sound reaches your ears.
This great speed of light produces some strange facts. Sunlight takes about 8 minutes to reach us. If you look at the light of the moon tonight, remember that the light rays left the moon 1.3 seconds before they reach you. The nearest star is so far away that the light which you can see from it tonight started to travel towards you four years ago. The light from some of tonight’s stars may have started on its journey to you before you were born.
解析
转载请注明原文地址:http://tihaiku.com/zcyy/3208956.html
相关试题推荐
AUNSecurityCouncildelegationtravelstoSouthAfricaonthefirststopofa
AUNSecurityCouncildelegationtravelstoSouthAfricaonthefirststopofa
[originaltext]Lighttravelsataspeedwhichisaboutamilliontimesfast
[audioFiles]audio_ezfz_0001(20096)[/audioFiles]AmongtheIndiansofNorth
[audioFiles]audio_ezfz_0033(20096)[/audioFiles]WhatWe
Whenwilltheydiscusstheagenda?[br][audioFiles]audio_ezfz2004_003[/audioFi
Whenwilltheydiscusstheagenda?[br][audioFiles]audio_ezfz2004_003[/audioFi
Whenwilltheydiscusstheagenda?[br][audioFiles]audio_ezfz2004_003[/audioFi
Whenwilltheydiscusstheagenda?[br][audioFiles]audio_ezfz2004_003[/audioFi
Whenwilltheydiscusstheagenda?[audioFiles]audio_ezfz2004_003[/audioFiles]A、
随机试题
[originaltext]W:Dr.Smith,thankyouforcomingtoourprogramme.M:Mypleasu
[originaltext]DecadesbeforetheAmericanRevolutionof1776,JesseFish,a
Properarrangementofclassroomspaceisimportanttoencouraginginteraction.
Forthispart,youareallowed30minutestowriteanessayonecologicalcivili
项目管理计划不包括( )。A.变更管理计划 B.变更日志 C.配置管理计划
申请强制执行是依法收贷的重要环节,申请执行的法定期限为()。A.4年 B
化学课上,教师给学生做用排水法收集氢气的实验,同学们通过认真观察学习的方法属于实
下列关于风景名胜区详细规划的表述,错误的是( )。A.详细规划要对整个风景名胜
劳动法律关系的主体是指()。A:工会代表与用人单位 B:工会与用人单位
子女教育需求增加,购房、购车贷款仍保持较高需求,成员收入稳定,家庭风险承受能力不
最新回复
(
0
)