Physics equations/21-Circuits, Bioelectricity, and DC Instruments/Q:RCdecay

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a21CircuitsBioInstDC_RCdecaySimple_v1
{A 621 mF capacitor is connected in series to a 628 k&Omega; resistor. If the capacitor is discharged, how long does it take to fall by a factor of e3? (where e =2.7...)} -a) 1.17 x 105 s. -b) 3.7 x 105 s. +c) 1.17 x 106 s. -d) 3.7 x 106 s. -e) 1.17 x 107 s.

2
{A 547 mF capacitor is connected in series to a 2 k&Omega; resistor. If the capacitor is discharged, how long does it take to fall by a factor of e4? (where e =2.7...)} -a) 1.38 x 103 s. +b) 4.38 x 103 s. -c) 1.38 x 104 s. -d) 4.38 x 104 s. -e) 1.38 x 105 s.

3
{A 819 mF capacitor is connected in series to a 798 k&Omega; resistor. If the capacitor is discharged, how long does it take to fall by a factor of e4? (where e =2.7...)} -a) 8.27 x 105 s. +b) 2.61 x 106 s. -c) 8.27 x 106 s. -d) 2.61 x 107 s. -e) 8.27 x 107 s.

a21CircuitsBioInstDC_RCdecaySimple_v1
{A 784 &mu;F capacitor is connected in series to a 543 k&Omega; resistor. If the capacitor is discharged, how long does it take to fall by a factor of e3? (where e =2.7...)} -a) 4.04 x 101 s. -b) 1.28 x 102 s. -c) 4.04 x 102 s. +d) 1.28 x 103 s. -e) 4.04 x 103 s.

2
{A 665 &mu;F capacitor is connected in series to a 806 k&Omega; resistor. If the capacitor is discharged, how long does it take to fall by a factor of e2? (where e =2.7...)} -a) 3.39 x 101 s. -b) 1.07 x 102 s. -c) 3.39 x 102 s. +d) 1.07 x 103 s. -e) 3.39 x 103 s.

3
{A 65 &mu;F capacitor is connected in series to a 414 k&Omega; resistor. If the capacitor is discharged, how long does it take to fall by a factor of e4? (where e =2.7...)} -a) 1.08 x 101 s. -b) 3.4 x 101 s. +c) 1.08 x 102 s. -d) 3.4 x 102 s. -e) 1.08 x 103 s.

a21CircuitsBioInstDC_RCdecaySimple_v1
{A 354 mF capacitor is connected in series to a 407 M&Omega; resistor. If the capacitor is discharged, how long does it take to fall by a factor of e3? (where e =2.7...)} -a) 4.32 x 107 s. -b) 1.37 x 108 s. +c) 4.32 x 108 s. -d) 1.37 x 109 s. -e) 4.32 x 109 s.

2
{A 206 mF capacitor is connected in series to a 990 M&Omega; resistor. If the capacitor is discharged, how long does it take to fall by a factor of e4? (where e =2.7...)} +a) 8.16 x 108 s. -b) 2.58 x 109 s. -c) 8.16 x 109 s. -d) 2.58 x 1010 s. -e) 8.16 x 1010 s.

3
{A 727 mF capacitor is connected in series to a 860 M&Omega; resistor. If the capacitor is discharged, how long does it take to fall by a factor of e3? (where e =2.7...)} +a) 1.88 x 109 s. -b) 5.93 x 109 s. -c) 1.88 x 1010 s. -d) 5.93 x 1010 s. -e) 1.88 x 1011 s.

a21CircuitsBioInstDC_RCdecaySimple_v1
{A 10 F capacitor is connected in series to a 9&Omega; resistor. If the capacitor is discharged, how long does it take to fall by a factor of e4? (where e =2.7...)} +a) 3.6 x 102 s. -b) 1.14 x 103 s. -c) 3.6 x 103 s. -d) 1.14 x 104 s. -e) 3.6 x 104 s.

2
{A 5 F capacitor is connected in series to a 8&Omega; resistor. If the capacitor is discharged, how long does it take to fall by a factor of e4? (where e =2.7...)} -a) 1.6 x 101 s. -b) 5.06 x 101 s. +c) 1.6 x 102 s. -d) 5.06 x 102 s. -e) 1.6 x 103 s.

3
{A 10 F capacitor is connected in series to a 10&Omega; resistor. If the capacitor is discharged, how long does it take to fall by a factor of e4? (where e =2.7...)} -a) 4 x 100 s. -b) 1.26 x 101 s. -c) 4 x 101 s. -d) 1.26 x 102 s. +e) 4 x 102 s.