The diameter of rain-drop is $0.02 \,cm$. If surface tension of water be $72 \times {10^{ - 3}}\,newton$ per metre, then the pressure difference of external and internal surfaces of the drop will be
The diameter of rain-drop is $0.02 \,cm$. If surface tension of water be $72 \times {10^{ - 3}}\,newton$ per metre, then the pressure difference of external and internal surfaces of the drop will be
- A
$1.44 \times {10^4}\,dyne - c{m^{ - 2}}$
- B
$1.44 \times {10^4}\,newton - {m^{ - 2}}$
- C
$1.44 \times {10^3}\,dyne - c{m^{ - 2}}$
- D
$1.44 \times {10^5}\,newton - {m^{ - 2}}$
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