The period of the output wave form for the circuit of figure

The period of the output wave form for the circuit of figure shown, when triggered by a negative pulse is—

This circuit work as monostable multivibrator Time period = T= 1·1 RC (seconds)
= 1·1 × 7·5 × 10³ × 0·1 × 10^–6 = 0·825 ms