Chapter 1 - Sections 1.1-1.8 - Exercises - Cumulative Problems - Page 41: 104

$7.2\times 10^{15}$

1. Conversion factors we need: $1h =60 min$ $1min = 60s$ $1s = 10^{12} ps$ 2. To get 2 hours in picoseconds we need multiply it by conversion factors: $2h \times 60 min/h \times 60s/min \times 10^{12} ps/s = 7200 \times 10^{12}=7.2\times 10^{15}$