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AP® Physics 1 & 2

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Moderate

Energy Required for Phase Change

APPH12-W0@RJA

Which of the following phase changes requires more energy added: melting a $5$ $kg$ block of ice or boiling a $1$ $kg$ mass of water?

Assume the temperature of the ice/water is already at the point for a phase change to occur.

(${ L }_{ f }$ $=$ $3.35\cdot { 10 }^{ 5 }$ $ \frac { J }{ kg }$; ${ L }_{ v }$ $=$ $2.26\cdot { 10 }^{ 6 }$ $ \frac { J }{ kg }$)

A

Melting a $5$ $kg$ block of ice.

B

Boiling a $1$ $kg$ mass of water.

C

Both require the same amount of energy.

D

Not enough information is available to answer this question.