In musical acoustics, a frequency ratio of 2:1 is called an octave. Humans with extremely good hearing can hear sounds ranging from 20 Hz to 20 kHz, which is approximately 10 octaves (since 2 10 = 1024 ≈ 1000).
(a) Approximately how many octaves of visible light are humans able to perceive?
(b) Approximately how many octaves wide is the microwave region?