A hairdryer wastes 376J for every 1500J of electrical energy it uses. How efficient is the hairdryer? Pls answer :

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?

By what factor does the drag force on a car increase as it goes from 65 to 110 km/h?

Compare the patterns of the two waves shown in the image. which statement is true about these waves?