What is the wavelength of 100-mhz television em waves?show work

Wavelength = (speed) / (frequency)

For radio, the speed is 3 x 10⁸ m/s .

So the wavelength is (3 x 10⁸ m/s) / (10⁸/sec) = 3 meters .

But before I let you go, I have to ask you about that " 100 MHz "
TV signal that somebody is transmitting !

100 MHz is the "100" smack in the middle of the FM radio dial,
and apparently, some irresponsible, unlicensed hacker has
built a TV transmitter of some kind, and plunked it down right
in the middle of the FM broadcast band.

Now, a TV transmission is much 'wider' than an FM radio signal.
(That's because it carries an FM sound channel PLUS a whole
video picture besides the sound.) So a standard broadcast-quality
TV signal operating at 100 MHz will obliterate nearly half of the
FM band on anybody's FM radio within at least a few miles of the
TV transmitter. I mean, it won't damage or burn up the radio, but
nobody will be able to HEAR any of the FM radio stations in the
middle half of the dial. All they'll hear ... smeared out across the
dial ... will be a jagged raspy BU that's more nerve-wracking
than chalk and fingernails on a blackboard both at the same time.
THAT's what the video part of a TV transmitter sounds like on a
regular FM radio.

100 MHz is not for TV. Everything between 88 - 108 MHz is for FM only.