Chapter 24 ---------- 2). Time of travel = distance/velocity For radio wave velocity is equal to velocity of light c = 3*10^8 m/s and time T = L/c, where L is a distance. Time for the signal travel from the Moon: T(Moon) = 3.85*10^8 m / 3*10^8 m/s = 1.28 s Time for the signal travel from Mars: T(Mars) = 5.6*10^10 m / 3*10^8 m/s = 187 s 3). The resonance frequency of a LC circuit (see equation 23.10) f = 1/[2*pi*sqrt(L*C)] We can invert this equation to solve for C C = 1/((2*pi*f)^2*L) = 1/((2*3.14*1.2*10^6 Hz)^2*2.6*10^(-4) H) = = 6.7*10^(-11)F = 670 nF 7). The relation between frequency, velocity and wavelength is c = f * lambda , where lambda is the wavelength and c is the speed of light. ---> f = c/lambda = 3*10^8 m/s / 2.1*10^(-9) m = 1.42*10^17 Hz 8). Here again c = f * lambda ---> lambda = c/f = 3*10^(8) m /2.70^9 Hz = 0.11 m 16). Time = distance / velocity T = L/c = 1.277*10^12 m / 3*10^(8) m/s = 4256 sec ~ 1.2 hours.