The longest wavelength of light that causes electrons to be ejected from the surface of a potassium metal plate is 539 nm. If 400 nm radiation is shone on potassium, what is the velocity of the ejected electrons?

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.