If Each of the Following Metals Is Exposed to Light $\varPhi$

Multiple Choice

If each of the following metals is exposed to light with a wavelength of 240 nm, which will emit photoelectrons with the greatest kinetic energy?

A) iron $\varPhi$ = 7.2 * 10^-19 J)
B) platinum $\varPhi$ = 9.1 *10^-19 J)
C) nickel ( $\varPhi$ = 8.3 *10^-19 J)
D) palladium ( $\varPhi$ = 8.2 *10^-19 J)
E) sodium ( $\varPhi$ = 4.4 *10^-19 J)