Light from a helium-neon laser (wavelength 633 nm) passes through a 0.5 mm diameter hole. how far away should a viewing screen be placed to observe a diffraction pattern whose central maximum is 3.0 mm in diameter ?

Which law represents the thermodynamic statement of the conservation of energy of a system? a. the fourth law b. the first law c. the second law d. the third law

Which fact supports the conclusion that there will be fewer farm managers in the future? a) a farmer manager’s duties vary by the type of farm. b) farm technology is replacing some administrative jobs c) farm managers often need experience but not education. d) administrative duties include budgeting and training staff.

Does heating a metal wire increase or decrease its electrical resistance? why?