Electromagnetic Radiation with a Frequency of 8 $\varPhi$ = 35 -10^-19 J)
B)gold

Electromagnetic radiation with a frequency of 8.6* 10¹⁴ Hz incident on an unknown metal surface causes the ejection of photoelectrons with kinetic energies of 2.8 *10^-19 J.What is the unknown metal?

A) rubidium ( $\varPhi$ = 3.5 -10^-19 J)
B) gold ( $\varPhi$ = 8.2 * 10^-19 J)
C) nickel ( $\varPhi$ = 8.3 *10^-19 J)
D) sodium ( $\varPhi$ = 2.9 * 10^-19 J)
E) platinum ( $\varPhi$ = 9.1 *10^-19 J)