WBJEE 2012 Chemistry Solved Paper

From Heisenberg uncertainty principle,
∆x⋅∆p≥‌

h

4π

.....(i)
or ∆x⋅m∆v≥‌

h

4π

or ∆x⋅∆v≥‌

h

4πm

....(ii)
This principle is also applicable for pairs like energy-time (∆E⋅∆t) and angular moment - angle (∆w⋅∆θ) along with position-moment (∆x⋅∆p)
Thus, ∆E⋅∆t≥

h

4π

.....(iii)