In an experiment, identical objects are placed on a glass slab, and a piece of sandpaper, as shown in the image. one end of both surfaces is raised 100 mm and the objects placed on them are observed. the ends are raised in increments of 100 mm until one of the objects begins to move. what does this experiment demonstrate? a) friction depends on the surface. b) friction is independent of the surface. c) friction is applicable to tilted surfaces only. d) friction depends on the object more than the surface.

Select light for the type of wave, adjust the wavelength so that the light is red, and increase the amplitude of the light to the max. then, select the start button at the source location to begin producing the waves. light is a form of electromagnetic wave, containing oscillating electric and magnetic fields. the wave amplitude detector mentioned above shows how the electric field oscillates in time at the location of the probe. the amplitude of the wave at the location of the probe is equal to the maximum electric field measured. how does the amplitude of the wave depend on the distance from the source?