Asolid, glowing-hot object will emit light over the full range of wavelengths resulting in a spectrum. if a diffuse and relatively cool cloud of gas is located between the glowing, hot object and an observer, the observer will detect an spectrum coming out of the cloud. another type of spectrum is given off by a neon sign which is a tube of gas whose electrons are excited by an electric current. the mostly red light given off by the sign is in the form of an spectrum.

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?