Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

A bow wake is created when the wave source moves faster than the wave propagation speed.
What is created when the wave source moves faster than the wave propagation speed?

Prostate is the most common type of cancer in adult males.
What is the most common type of cancer in adult males?

Kilojoules are typically used to measure heats of reaction.

What units are typically used to measure heats of reaction?