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The surface tension of water at 20^(@)C ...

The surface tension of water at `20^(@)C` is `73` dynes `cm^(-1)`, The minimum value of work done needed to increases surface are of water from `2 cm^(2)` to `5cm^(2)` is

A

`192` dynes `cm`

B

`219` dynes `cm`

C

`921` dynes `cm`

D

`912` dynes `cm`

Text Solution

Verified by Experts

The correct Answer is:
B
`w= gammadA= 73xx3= 219` dynes cm
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