- #1

Rifat amin

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- Homework Statement
- Below 20K, The specific heat capacity c of silver varies with temperature according to the equation

c

/

J /kg /K

=

1.5

x

10

−

4

(

T

/

K

)

3

+

6.0

x

10

−

3

T

/

K

. If a small silver sphere of diameter 4am and at 20K is placed in 25g of liquid helium at 4K, what fraction of the liquid will evaporate?

[Density of silver = 1.05E4 kg/m^3, specific latent heat of vaporisation of helium = 2.1E4 J/kg; boiling point of helium = 4K]

- Relevant Equations
- c

/

J /kg /K

=

1.5

x

10

−

4

(

T

/

K

)

3

+

6.0

x

10

−

3

T

/

K

Not attempt