In your own words, what is a wavelength

It is the distance between one peak to the next in the wave. Calculated as wavelength(meters) = 300/frequency(MHz)

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

answera compound;