Light with a wavelength of 420 nm shines on a metal surface, which emits electrons. The stopping potential is measured to be 0.660 V. a. What is the maximum speed of emitted electrons?b. Calculate the work function. c. Identify the metal.

Two conductors, a and b, are each in the shape of a tetrahedron. but of different sizes. they are charged in the following manner: 1. tetrahedron a is charged from an electrostatic generator to charge q. 2. tetrahedron a is briefly touched to tetrahedron b. 3. steps 1 and 2 are repeated until the charge on tetrahedron b reaches a maximum value. if the charge on tetrahedron b was q/4 after the first time it touched tetrahedron a. what is the final charge qbmax on tetrahedron b?