Why do metals have body-centered, face-centered, and hexagonal-centered structures?

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?

Which theory was contradicted by experiments with the photoelectric effect? light spreads out after it passes through a small opening. as soon as light strikes metal, electrons will be ejected. visible light, regardless of color, will cause the ejection of electrons when striking metal. the kinetic energy of ejected electrons depends on the frequency of light that strikes the metal.