M(1) 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0,4 0.3 0,2 0.1 0.0 First-order system frequency response: Magnitude Ratio, M(1) 10 1000 10000 100000 100 frequency (Hertz) 19. The approximate time constant of a first-order thermocouple response plotted in the figure above is: (a) 1000 s (d) 0.0016 s (b) 100 s (c) 0.01 s 20. What is the cut-off frequency of the thermocouple with response plotted in the figure above? (a) 1 Hz (b) 10 Hz (c) 100 Hz (d) 1000 Hz L L