Light of wavelength 559 nm is used to illuminate normally two glass plates 22.1 cm in length that touch at one end and are separated at the other by a wire of radius 0.026 mm. how many bright fringes appear along the total length of the plates.

The temperature in gavin's oven is a sinusoidal function of time. gavin sets his oven so that it has a maximum temperature of 280°f and a minimum temperature of 240°. once the temperature hits 280°, it takes 20 minutes before it is 280° again. gavin's cake needs to be in the oven for 30 minutes at temperatures at or above 270°. he puts the cake into the oven when it is at 260° and rising. how long will gavin need to leave the cake in the oven? (round your answer to the nearest minute.)