Light with 4.5 eV of energy hits a metal surface with a work function of 3.2 eV. Will electrons be emitted ? If so how much energy ?

Yes, electrons with energy of 1.3ev will be emitted from the metal surface

Explanation:

From Eisenstein's photoelectric equation;

KE= E - Wo

Where;

KE= kinetic energy of the emitted photoelectron = ??

E= Energy of the photon =4.5 ev

Wo= work function of the metal = 3.2ev

KE= 4.5 ev - 3.2 ev

KE= 1.3 ev

water at room temperature is flowing through a pipe with pressure taps located 10 ft apart along one section of the pipe, which are connected to a mercury (s=13.6) manometer.