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Heinrich Rudolf Hertz
X-ray
Wilhelm Conrad Röntgen
File:Inverse square law.svg
Radiometer
Spectrum
Waves
Electromagnetism
Radiation
X-rays
Measuring instruments
Darkmatter
Radiometry
SIGINT
Electromagnetic radiation meters
Terahertz radiation
Radio waves
Dark matter
Electromagnetic compatibility
Electromagnetic devices
Fluorometer
Photometers
Electromagnetic spectrum