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 simple interest on a loan of $200 at 10 percent interest per year is $10 per year until the loan is paid off. $15 per year until the loan is paid off. $20 per year until the loan is paid off. $25 per year until the loan is paid off.

Avehicle has an oil leak that is causing the entire oil pan to be wet, but inspection reveals no exact source after cleaning off the oil residue. technician a says to install a fluorescent dye in the crankcase and operate the engine, then re-inspect for leaks with a special light (black light). technician b says the oil leak may be coming from a source at the top of the engine, such as a valve cover gasket. who is correct?

Aforklift raises a 1,020 n crate 3.50 m up to a shelf. how much work is done by the forklift on the crate? the forklift does j of work on the crate.