Answer my physics question por favor!! If a cordless phone uses a frequency of 900 MHz and can operate up…?
If a cordless phone uses a frequency of 900 MHz and can operate up to 60 meters away from its base, how many wavelengths of the radio waves can fit between your ear and a base 60 meters away?
hey billrussell it says how many "wavelengths" ur answer is in meters!!
oh k u changed it nm 
One Response
billrussell42
24 Dec 2009
λf = c = 3*10⁸(speed of light)
λ = 3*10⁸/900E6 = 3.33E-1 = 0.333m
60/0.333 = 180 wavelengths