GATE Electronics and Communications (EC) 2017 Shift 1 Solved Paper

The voltage of an electromagnetic wave propagating in a coaxial cable with uniform characterstic impedance is V(l) = e^–yl+jωt Volts, where l is the distance along the length of the cable in metres, γ = (0.1 + j40)m^–1 is the complex propagation constant, and ω = 2π × 10⁹ rad/s is the angular frequency. The absolute value of the attenuation in the cable in dB/metre is ________.