Ultraviolet light with a frequency of 3.00x10^15 hz strikes a metal surface and ejects electrons that have a maximum kinetic energy of 6.1 ev. what is the work function (in ev) of the metal ? (h = 6.63x10^-34 j. s and 1 ev = 1.60x10^-19j)

Explanation:

Frequency of 3 x 10¹⁵ ,  wavelength = 3 x 10⁸/3 x 10¹⁵ = 10⁻⁷ m = 1000A.

Energy in eV = 12375/1000 = 12.375 eV.

Maximum kinetic energy of ejected electrons = 6.1 eV

Work function = 12.375 - 6.1 = 6.275 eV.

the pull of gravity on the rocket decreases