What is Not an example of an machanical wave

Abeam of electrons with of wavelength of 7.5 x 10-6 m is incident on a pair of narrow rectangular slits separated by 0.75 mm. the resulting interference pattern is projected onto a screen 10.0 m from the slits. what is the separation of the interference maxima in the resulting interference pattern?

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

The mini-refrigerator fire was most likely caused by what type of wiring?