Coherent orthogonal binary FSK modulation is used to transmit two equiprobable symbol waveforms s₁(t) = α cos 2πf₁t and s₂(t) = α cos 2πf₂t, where α = 4 mV. Assume an AWGN channel with two-sided noise power spectral density N₀/2 = 0.5 × 10^-12 W/Hz. Using an optimal receiver and the relation Q(v) = (1/√(2π)) ∫_v^∞ e^-u2/2 du, the bit error probability for a data rate of 500 kbps is