Which of these are not mechanical waves and can be used to send a signal to astronauts on the moon?

a) sound waves
b) radio waves
c) both sound waves and radio waves
d) neither sound waves or radio waves

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

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z

(1 point) match the differential equations and their vector valued function solutions. you may wish to multiply at least one solution out fully, to make sure that you know how to do it. you can get the other answers quickly by process of elimination and just multiply out one row element.