I hope we will use the Net to cross barriers and connect cultures.
The original idea of the web was that it should be a collaborative space where you can communicate through sharing information.
That idea of URL was the basic clue to the universality of the Web. That was the only thing I insisted upon.
The Web is now philosophical engineering. Physics and the Web are both about the relationship between the small and the large.IT professionals have a responsibility to understand the use of standards and the importance of making Web applications that work with any kind of device.
• We say that sound needs a medium to travel through.
• The medium your voice travels through is air
. • Sound travels through wood and bricks.
• Sound travels very well in solids
What happens when there is no medium? If you are able to watch the video of a bell ringing in a vacuum, then do so. Sound needs a medium to be able to travel. A vacuum is where there is no air or any other matter. So do you think you will be able to hear a bell ringing in a vacuum?
真空＝ vacuum は数えられる名詞です。上記でも A vacuumとなっていますね。
そしてテキストでは次に volume と pitchについて、わかりやすい説明が続いています。
Making sounds
Sometimes you need to speak softly when you whisper a secret to a friend.
But other times you need to shout loudly to your friend on the other side of the playing field!
Sounds have different volumes. Also, a mouse makes a very squeaky, high sound.
But a lion makes a low growl.
The sounds that these animals make have different pitches.
