What are the effects of radio waves on matter? Different regions of the electromagnetic spectrum interact differently with matter:


Microwave radiation can induce molecular rotation.
Infrared radiation can induce molecular vibration.
Visible and ultraviolet light can induce electron excitation.
X-rays and gamma rays can induce ionization.


Is there any activity specific only to radio waves? I kept on thinking how radio waves are used in NMR but I don't know what to call it.
This is a bit of a stretch, but the Zeeman and Stark effects are linked to radio frequencies, in that line splitting of a visible spectral frequency (~10^15 Hz) can give rise to a beat-frequency in the RF. Your answer of NMR, though, is more applicable. The most general term for precession in a magnetic field is Larmor precession.