The speed of a wave pulse on a string depends on the tension, F, in the string and the mass per unit length, μ, of the string. Tension has SI units of 
and the mass per unit length has SI units of 
What combination of F and μ must the speed of the wave be proportional to?
Definitions:
Temperature
Temperature is a measure of the thermal energy present in an object or environment, indicating how hot or cold it is.
Zeitgeber
An external or environmental cue, such as light or temperature, that helps regulate the biological rhythms of an organism.
Potent
Having a strong effect or powerful influence.
Light
Electromagnetic radiation within a certain portion of the electromagnetic spectrum, which can be perceived by the human eye.
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