An astronomical observatory monitors a star system and records four different electromagnetic emissions:
Which of these signals belongs to the visible region of the electromagnetic spectrum?
(Planck constant h=6.63×10−34 J sh = 6.63 \times 10^{-34}\text{ J s}h=6.63×10−34 J s, speed of electromagnetic waves in a vacuum c=3.00×108 m s−1c = 3.00 \times 10^{8}\text{ m s}^{-1}c=3.00×108 m s−1)
Signal P
Signal Q
Signal R
Signal S
