/sci/ - Science & Math

A metal requires a photon of wavelength 250. nm to just eject an electron with no kinetic energy. If a photon of wavelength 200. nm strikes the metal, what will be the velocity of the electron that is ejected?
Question 2 options:
6.6 x 105 m/s
3.2 x 105 m/s
4.7 x 104 m/s
8.2 x 106 m/s
2.1 x 106 m/s
Determine the INCORRECT statement regarding ionization energies [ IE(1) means first ionization energy, IE(2) is second ionization energy, etc....]
Question 3 options:
IE(2) P > IE(1) P
IE(2) Na > IE(2) Mg
IE(2) Na > IE(2) K
IE(1) S > IE(1) Te
IE(1) Cl > IE(1) F


Which one electron configuration corresponds to an excited state of a neutral halogen atom (Group 17 or 7A)?
Question 1 options:
[Ne]3s24s2
[Ne]3s13p6
[Ar]4s23d24p4
[Ar]3d5
[Kr]5s24d105p5