Se a função trabalho (Ø) de um metal for 1,8eV, qual é, em volt, o potencial de corte para a luz de comprimento de onda 350nm?
(h= 4,14. 10^-15 ev.s = 6,625. 10^-34J.s; 1eV = 1,6. 10^-19J; c= 3.10^8 m/s; e = 1,6. 10^-¹⁹ C) ​
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