Question

(a) Calculate the range of wavelengths (in m) for visible light given its frequency range is 380 to 760 THz.smaller valuem =larger valuem (b) Do the same for the FM frequency range of 88.0 to 108 MHz.smaller valuem =larger value m =†

Answer 1

(a)

v = f λ

λ = v / f

Where:

λ = wavelenght

v = speed of light = 3 x 10^8 m/s

f = 380 THz =3.8 x10^14 Hz

f = 760 THz = 7.6 x10^14 Hz

λ = 3x10^8 / 3.8x10^14 = 7.9 x10^-7 m

λ = 3x10^8 / 7.6x10^14 = 3.9 x10^-7 m

b)

λ = 3x10^8 / 88x10^6 =3.4 m

λ = 3x10^8 / 108x10^6 = 2.78 m