After one species disappears the other species in the

Abeam of electrons with of wavelength of 7.5 x 10-6 m is incident on a pair of narrow rectangular slits separated by 0.75 mm. the resulting interference pattern is projected onto a screen 10.0 m from the slits. what is the separation of the interference maxima in the resulting interference pattern?

Why is metal often used for cooking pan?

Gunpowder residue is most likely to show up where on a shooters hands