Abeam of monochromatic light (f =5.09 ×1014 hz) has a wavelength of 589 nanometers in air. what is the wavelength of this light in lucite?
(1)150 nm
(2)393 nm
(3)589 nm
(4)884 nm

Decreased sensitivity to an unchanging stimulus is known as

Efficiency is the ratio of to for a system a)power in to power in b)power in to power out c) power out to power out d) power out to power in

Ahair dryer is basically a duct in which a few layers of electric resistors are placed. a small fan pulls the air in and forces it through the resistors where it is heated. air enters a 1200 w hair dryer at 100 kpa and 22°c and leaves at 47°c. the cross-sectional area of the hair dryer at the exit is 60 cm2. neglecting the power consumed by the fan and the heat losses through the walls of the hair dryer, determine (a) the volume flow rate of air at the inlet and (b) the velocity of the air at the exit.