Scientists such as heinrich hertz, philipp lenard, max planck, and albert einstein made scientific contributions that ultimately demonstrated that light is electromagnetic radiation, and that it has a “dual nature.” some electromagnetic phenomena are best explained with a particle model, and some with a wave model. in a sense, “wave” and “particle” are just easy mental models for light. we employ them because we are used to seeing waves and particles—such as those in water waves and baseballs—in our daily lives. electromagnetic radiation is a basic concept in physics, but it doesn’t fit completely into one of these neat little boxes. research and discuss at least one modern technology that employs electromagnetic radiation and that can be explained by the wave model, the particle model, or a combination of the two. some possible technologies include solar panels, burglar alarms, cameras, and cell phones.

Astudent wears sunglasses to her read a book more easily which wave interaction occurs as light passes from the air into the plastic lenses? a polarization b.refraction c.diffraction d. interference

What are two different ways you could find the value of a? explain these methods.

To understand the electric potential and electric field of a point charge in three dimensions consider a positive point charge q, located at the origin of three-dimensional space. throughout this problem, use k in place of 14? ? 0. part adue to symmetry, the electric field of a point charge at the origin must point from the origin.answer in one word.part bfind e(r), the magnitude of the electric field at distance r from the point charge q.express your answer in terms of r, k, and q. part cfind v(r), the electric potential at distance rfrom the point charge q.express your answer in terms of r, k, and q part dwhich of the following is the correct relationship between the magnitude of a radial electric field and its associated electric potential ? more than one answer may be correct for the particular case of a point charge at the origin, but you should choose the correct general relationship. a)e(r)=dv(r)drb)e(r)=v(r)rc)e(r)=? dv(r)drd)e(r)=? v(r)r