Mechanical Waves: Water drops make waves., Ships and animals using sonar, Sound Waves, THE FOURTH DIGIT IS 2., Requires matter to travel through., Can be both transverse and longitudinal waves., THE FIRST DIGIT IS 9., Electromagnetic Waves: X-Rays, Radio Waves, THE SECOND DIGIT IS 4., Can travel through matter AND empty space., Can only be a transverse wave., Used by cell phone towers to transmit data to phones., THE THIRD DIGIT IS 7.,

Mechanical or Electromagnetic? Hunt for the 4 digit code!

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