E-M waves of different frequency (wavelength)

It turns out that most of you are already familiar with a broad range of E-M waves.


Q. What is the wavelength of 810 Kilohertz on your AM radio dial?

"kilo->"1000"; "hertz" -> 1/second

wavelength = c/f = 300,000(km/sec)/810,000(1/sec) = 0.37 km = 7839.5 ft(!)


VISIBLE LIGHT - Some Details


Q. What wavelengths are reflected by a White shirt?

All wavelength are reflected by a white shirt.


Q. What color is a Yellow banana illuminated with Red light?

Since a yellow banana reflects only yellow light, a yellow banana illuminated by red light will appear black.


E-M radiation and the atmosphere