Study Table 12.3 and answer the questions.
a. Which type of radiation has the narrowest range of wavelengths?
b. Which has the second narrowest range?
c. What is the range of wavelengths of microwaves, in millimetres?
d. What is the range of wavelengths of visible light, in nanometres?
e. What is the frequency range of visible light?

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Type of electromagnetic waves Wavelength range / m radio waves >106 to 10-1 microwaves 10-1 to 10-3 infrared 10-3 to 7 x 10-7 visible 7 x 10-7 (red) to 4 x 10-7 (violet) ultraviolet 4 x 10-7 to 10-8 X-rays 10-8 to 10-13 y-rays 10-10 to 10-16