Posted
on February 13, 2015
The
subtitle of the day, according to the official website,
is “Celebrating radio...by youth, for youth...in safety and
security."
The
website offers 10 fun ways to celebrate the day, an infographic about
youth and radio, links, and graphics such as banners, logos, and
posters.
Whether
you listen to the World Radio Day broadcast, create your own radio
show, or hold a radio party, there are several interesting things to
consider on this website...like the intersection of “radio” and
“internet.”
As we have seen with TV and movies, radio is becoming
more and more of a “streaming” thing in addition to a “broadcast”
thing.
We can enjoy niche stations that only interest a small
minority of people.
We can create our own content and upload it to
Soundcloud.
How
does radio work?
It
would seem to make sense that radio waves would be a kind of sound
wave, but no. Actually, radio waves are more like visible
light!
Visible light and radio waves, along with things like infrared, ultraviolet, microwaves, and X-rays, are all forms of electromagnetic radiation. They all travel through a vacuum (essentially empty space, without air) at what we call the speed of light. Radio waves are much, much bigger than light waves (in terms of their wavelength).
Visible light and radio waves, along with things like infrared, ultraviolet, microwaves, and X-rays, are all forms of electromagnetic radiation. They all travel through a vacuum (essentially empty space, without air) at what we call the speed of light. Radio waves are much, much bigger than light waves (in terms of their wavelength).
Sound
waves, on the other hand, are a vibration of something – often, a
vibration of air or water molecules, or a vibration of a piece of
metal or diaphragm. Sound waves cannot travel in a vacuum. And they
travel much slower than light and radio waves...which is why you see
far-away lightning before you hear its thunder.
Of course, our radios are designed to snatch radio waves and turn them into sound!
It
isn't just AM/FM radios and ham radios that use radio waves; cordless
phones, garage door openers, cell phones, TV remotes,
remote-controlled toys, GPS devices, satellite transmissions, WiFi,
and airplane controls all use radio waves.
Also
on this date:
Plan
ahead:
Check
out my Pinterest boards for:
And
here are my Pinterest boards for:
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