Me fast

1.) which of the following materials is an insulator against the electric current?

a.) a rubber tire

b.) a light bulb filament

c.) copper wire

d.) a silver necklace

if i get the right answer you can be marked as brainiest

The two most prominent wavelengths in the light emitted by a hydrogen discharge lamp are 656(red) and 486 (blue). light from a hydrogen lamp illuminates a diffraction grating with 500 lines per mm, and the light is observed on a screen 1.50 behind the grating. what is the distance between the first-order red and blue fringes?