Calculate the speed or magnitude of the speed with which a longitudinal wave propagates with a frequency of 120 Hz/s and a wavelength of 10 m/cycle. 1.- What is the illumination produced by a 120 cd lamp on a perpendicular surface located at a distance of 2.5 cm away? 2.- A lamp in a classroom has an intensity of 250 cd, what is the illumination that it produces on a notebook, if there is a distance of 3m and an angle of 45º between them? I would be grateful for your answers :) :

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