What change in charge takes place as a metal loses one or more electrons?

Since electrons have a negative charge, I would assume that the metal would become "less negative" or "more positive."

in case you improve the wavelength of incident radiation , the form of photoelectrons does no longer exchange because of fact the form of photoelectrons matter in basic terms on the intensity of sunshine,no longer its frequency.

Electrons are negative, protons are positive and neutrons are neutral. If you take an atom of a metal e.g. Na, and knock off an electron, the charge will be imbalanced. As the number of protons and electrons in a neutral atom are equal, losing an electron, (or negative charge), will cause the atom to become positive
e.g. Na loses e- = Na+
Na+ loses e- = Na2+
etc........

for every 1 electron it looses it gets a +1 charge.
For every 1 electron it gains it gets a -1 charge.