The work function of a metal surface is 4.80 × 10-19 j. the maximum speed of the electrons emitted from the surface is va = 7.7 × 105 m/s when the wavelength of the light is λa. however, a maximum speed of vb = 5.1 × 105 m/s is observed when the wavelength is λb. find the wavelengths λa and λb.

The sun generates both mechanical and electromagnetic waves. which statement about those wave is true?

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

An electron is trapped at a defect in a crystal. the defect may be modeled as a one-dimensional, rigid-walled box of width 1.00 nm. (a) sketch the wavefunctions and probability densities for the n 1 and n 2 states. (b) for the n 1 state, nd the probability of nding the electron between x1 0.15 nm and x2 0.35 nm, where x 0 is the left side of the box. (c) repeat (b) for the n 2 state. (d) calculate the energies in electron volts of the n 1 and n 2 states