Which of the following is produced by moving parts of machine?
light
sound
electricity
heat

It’s electricity it won’t move unless it has mechanical components

For example when your power in your house goes out you need a generator that Converts the mechanical energy into electrical energy which is what brings the power back to your house. Hope this help

low freq = 100 mhz

low wavelength =101.7m

length = 3x10^8/freq