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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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Knowledge Check

  • The surface tension of water of 20^(@) is 72.75 dyne cm^(-1) . Its value in SI system is

    A
    2.275 `Nm^(-1)`
    B
    0.7275 `Nm^(-1)`
    C
    0.07275 `Nm^(-1)`
    D
    None of the above

  • 203. Surface tension of water at 25^(@)C is 7.2 xx 10^(-2) Nm^(-1) . In order to increase surface area of water by 100 cm^(2) , the amount of work done will be

    A
    `7.2 xx 10^(-4)J`
    B
    `7.2J`
    C
    72J
    D
    0.72J

  • The surface tension of water in C.G.S units is 70 dyne / cm . Its S.I unit is

    A
    70N//m
    B
    `7xx10^(-2)` N//m
    C
    0.7N//m
    D
    `7xx10^(3) N//m`