Question: what are the uses of the 7 electromagnetic waves?
Answer: Radio Waves: Instant Communication. ••• Radio waves are the lowest-frequency waves in the EM spectrum. ... 
Microwaves: Data and Heat. ••• ... 
Infrared Waves: Invisible Heat. ••• ... 
Visible Light Rays. ••• ... 
Ultraviolet Waves: Energetic Light. ••• ... 
X-rays: Penetrating Radiation. ••• ... 
Gamma Rays: Nuclear Energy. •••