Which describes a p-type semiconductor?

His image shows four different finches charles darwin found while on the galapagos islands. which of these would be most adapted to eating nuts and seeds?

What are atoms of the same element with varying number of neutrons

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?