Question: A blind riser of Design A has been changed to Design B with r = 2 * r c , as shown below.

A blind riser of "Design A" has been changed to "Design B" with r=2*rc, as shown below.
How much will the solidification time of the Design B change? Note that the identical material is cast under the same casting conditions and using the same mold material without changing any other entities of the mold.
4 times slower than its original time
4 times faster than its original time
2 times slower than its original time
2 times faster than its original time
no difference in the solidification time
A blind riser of "Design A " has been changed to

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