a gardner cuts a stem from a bush and places the stem in the dirt and it grows roots. which asexual plant process does this describe?

stem cutting

bulbs

tubers

runners

The keyword here is "Gardner cuts a stem " and so the answer is:

Stem Cutting

and here is why: If cut, stems that were still attached to their parent plant before cutting may form roots from where they were in contact with a rooting medium.  Some plants are very particular about what type a of cutting will root, but most are decently flexible. One thing to remember is that when you are using the cutting method, make sure to just cut off a piece of leaf or stem and then let it dry. The trick to getting this to work is to make sure to keep it totally dry otherwise the cutting won't feel the need to grow roots.

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b.transmitters send radio waves, and receivers capture radio waves.

this is poiselle's equation from fluid mechanic in physics. mech eng