19. Determine the bond order (BO) of the cyanide molecule, CN and the cyanide ion, CN-1 Bond order (BO) of (A) CN is 0.5; CN-1 is 1, (B) CN is 1.5; CN-1 is 2, (C) CN is 2.5; CN-1 is 3 , (D) CN is 3.5; CN-1 is 4, (E) CN is 4.5; CN-1 is 5

1. A beam of light with an intensity of 15 W is. incident on a copper plate (work function is7.43xl0-19 J). Electrons with a minimum wavelength of 3.75x10 －10 m are ejected from the surface of the copper. Calculate the frequency of the incident light. [Hint: Plank constant = 6.626 x 10－34J·s] (A)3.7lx1015Hz (B) 3.71 x 1016 Hz,(C) 3.71 x 1017 Hz,(D) 3.71 x 1018Hz(E) none of above

19. Determine the bond order (BO) of the cyanide molecule, CN and the cyanide ion, CN^-1 Bond order (BO) of
(A) CN is 0.5; CN^-1 is 1,
(B) CN is 1.5; CN^-1 is 2,
(C) CN is 2.5; CN^-1 is 3 ,
(D) CN is 3.5; CN^-1 is 4,
(E) CN is 4.5; CN^-1 is 5

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