The longest wavelength of light that causes electrons to be ejected from the surface of a potassium metal plate is 539 nm. If 400 nm radiation is shone on potassium, what is the velocity of the ejected electrons?

The longest-wavelength light that causes an electron to be emitted from gaseous lithium atom is 520 nm.

Explanation:

 The solvent  for  the mixture  is  water

    Explanation

Solvent  is substance  that dissolves  the solute  in  a solution.solvent  must be  present at a higher  percentage  as compared to  solute.    water   is the  solvent in a homogeneous mixture  that consists 12% ethanol, 28%  methanol and 60%  water, since  it contain more %  than ethanol  and methanol.