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An instrument for measuring the intensity of electromagnetic radiation (usually by the photochemical effect)
Answer for the clue "An instrument for measuring the intensity of electromagnetic radiation (usually by the photochemical effect) ", 11 letters:
actinometer
Word definitions for actinometer in dictionaries
Wiktionary
Word definitions in Wiktionary
n. (context physics English) A device used to measure the heating power of electromagnetic radiation, especially that of solar radiation.
WordNet
Word definitions in WordNet
n. an instrument for measuring the intensity of electromagnetic radiation (usually by the photochemical effect)
The Collaborative International Dictionary
Word definitions in The Collaborative International Dictionary
Actinometer \Ac`ti*nom"e*ter\, n. [Gr. ?, ?, ray + -meter] An instrument for measuring the direct heating power of the sun's rays. An instrument for measuring the actinic effect of rays of light.
Wikipedia
Word definitions in Wikipedia
Actinometers are instruments used to measure the heating power of radiation . They are used in meteorology to measure solar radiation as pyrheliometers . An actinometer is a chemical system or physical device which determines the number of photons in a ...