What is the frequency of highly energetic ultraviolet radiation that has a wavelength of 129 nm? The speed of light is 3 × 108 m/s. Answer in units of Hz.

The solar panels used by mark function because of the photoelectric effect. light shines on the cells causing electrons to be ejected from the metal, which produces an electric current. at night on mars, no light will fall on the solar cells and no electric current will be generated. according to your notes, what type of light is typically needed to cause the photoelectric effect? a)visible b)ultraviolet c)infrared

There are two-speed cameras, one in an are where the speed limit is 30 km/h and another where the speed limit is 50 km/h. in which will there be a smaller time interval between the photographs? explain your answer.

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?