An electromagnetic wave is composed of electrical and magnetic energy. true or false

Hen a gfci receptacle device is installed on a 20-ampere branch circuit (12 awg copper), what is the minimum volume allowance (in cubic inches) required for conductor fill for each conductor in the outlet box?

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?

Exercise 2. find the wavelength of a photon emitted when an electron jumps from the n = 3 energy level down to the n = 2 energy level. where is this photon in the electromagnetic spectrum?