The first flag of the United States of America had 13 stars, white  on a field of blue representing a new constellation.. The 13 stars  actually represented the first 13 stâ¦ates of our new nation in 1776.
#c = 3.00 x 10^8#m/s (the speed of light in a vacuum) #lambda# = wavelength in meters. #nu# = frequency in Hertz (Hz) or #1/s# or #s^-1#. So basically the wavelength times the frequency of an electromagnetic wave equals the speed of light. FYI, #lambda# is the Greek letter lambda , and #nu# is the Greek letter nu (it is not the same as a v). To find wavelength (#lambda#), the equation is manipulated so that #lambda = c/nu#. EXAMPLE PROBLEM.
The formula for frequency is: f (frequency) = 1 / T (period). f = c / Î» = wave speed c (m/s) / wavelength Î» (m). The formula for time is: T (period) = 1 / f (frequency). The formula for wavelength is Î» (m) = c / f Î» = c / f = wave speed c (m/s) / frequency f (Hz). The unit hertz (Hz) was once called cps = cycles per second. Choose: Speed of sound in air at a temperature of 20Â°C: c = 343 m/s or speed of radio waves and light in a vacuum: c = 299,792,458 m/s. The propagation speed of electrical signals via optical fiber is about 9/10 the speed of light, that is â 270,000 km/s.