The chart shows the power ratings of 3 clothes dryers and the time needed to dry a load of 10 towels.

what is the difference in energy used between the dryer that uses the greatest amount of energy and the dryer that uses the least amount?

0.18 kwh
0.20 kwh
1.62 kwh
1.82 kwh

Light from a sodium lamp passes through a diffraction grating that has 1000 slits per millimeter. the interference pattern is viewed on a screen 1.000 m behind the grating. the first (m = 1) two bright yellow fringes that are visible are 0.7288 m and 0.7300 m from the central maximum. what are the wavelengths of these two fringes?