When light of wavelength 250 nm shines on a metal surface the maximum kinetic energy of the photoelectrons is 1.82 eV. What is the maximum wavelength (in nm) of light that will produce photoelectrons from this surface?

Ahole in the ground in the shape of an inverted cone is 14 meters deep and has radius at the top of 11 meters. the cone is filled to the top with sawdust. the density of the sawdust depends upon the depth, x, following the formula ρ ( x ) = 2.5 + 1.2 e − 0.7 x kg/m3. find the total mass of sawdust in the conical hole.