The resistance of the circuit is 
Explanation:
We can solve the problem by applying Ohm's law, which gives us the relationship between current, potential difference and resistance in a circuit:

where
V is the potential difference
R is the resistance
I is the current
For the circuit in this problem,
V = 12.6 V
I = 25.4 A
Re-arranging the equation, we can solve for the resistance:

Learn more about current and potential difference here:
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The Wavelength is the distance between the same points on two adjacent (neighbouring) disturbances (e.g. from crest to crest or from compression to compression) i.e. one full cycle of the wave.
Yeah I guess it makes sense
Compressional waves are mechanical.mechanical waves require a medium to travel. in a vacuum, there is no matter, so the waves cannot travel