a tuning fork can act like an antenna...
strike one, it vibrates, causing another one near it to vibrate.
then, you hold the first one. the second one is still vibrating.
the same signal is propagated through!! like a radio EM antenna.
tuning forks are "connected" by air particles
imagine that the waves are "solid", so that when you move one tuning fork forward, the other is pushed forward as well (with some delay). they can be pushed forward and back at resonance.
for a real antenna,
light only absorbed if electron's natural frequency matches that of signal. Turns it into pure vibration, thus thermal energy. ah... 2.4 GHz is near the natural frequency of ... water! that's how a microwave works.
