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photoelectrons __ are electrons which have been emitted form an object illuminated by electromagnetic radiaton gamma rays __is EM radiation that comes from nuclear reactions ultaviolet rays __is EM radiation that causes sunburn infrared rays __ is EM radiation in the form of heat x-rays the invers photoelectric effect explains the production of __ longitudinal sound is an example of __ waves. Doppler effect the __ is a detected chanfe in frequency of sound due to the motion of the source of motion of the listener. pitch __ is the characteristic of sound related to frequency loudness __ is the characteristic of sound related to intensity threshold of hearing the __ is the average fainteest audible sound = 10^-16 w/cm beats __ are pulses in sound caused by standing waves created by two close frequencies vaccum sound will not travel through a __ resonance __ is causing an object to vibrate at its natural frequency without touching it virtual __ images are not made with real rays of light, are right-side-up, and cannot be projected on a screen real __ images are made withreal rays, are inverted, and can be projected focus in constructing ray diagrams in concave mirrors, parallel rays will reflect through the__ convex the focal length is negative for a __ mirror intercept an image is alwats formed where the reflected rays __ parabolic spherical aberration may be corrected with a __ mirror convex a __ lens is thicker in the middle than at the edge index of refraction __ is the ratio of the speed of light in a vaccum to the speed of light in a substance double refraction a right angle prosm reflects better than a mirror because it does not have __ optical center a point on a lens where there is no refraction is the __ critical the __ angle is the angle of incidence in which the angle of refraction is 90 towards if a ray travels at an angle from a medium or higher optical density to a medium of lower optical density, it will bend __ the normal red, green, and blue __ are the three primary colors of light double refraction __ is the bending of two different planes of polarization at different amounts such as in Iceland Spar crystals polarized __ light is light that vibrates in only one plane complimentary two __ colors will combine to form white light pigment a __ is a chemical that reflects and absorbs certain colors of light electroscopes an instrument used to detect a static charge is the __ insulators __ are materials that do not transfer electrons easily because they have few free electrons to give up spark a __ discharge is a rapid release of static charge corona St. Elmo's Fire is an example of a __ discharge. capacitor a __ has two conducing plates separated by a dielectric and is used to store an electric charge alternating an __ current flows in two directions and is produced by a generator peizoelectric the__ effect is the production of an electric current with stree on crystals electromagnetic induction __ is forcing electrons to move with spinning wires in a magnetic field load a __ is a device in a circuit that uses the electric energy series a __ circuit has a single path for the flow of the current resistance __ is the opposition to an electric current thermocouple a digital thermometer is an example of a __ photoelectric production of an electric current in the presense of light is the __ effect ferromagnetic __ substances are strongly attracted to magnets domains __ are microscopic magnetic regions generators and motors __ and __ are opposites in that the former changed mechanical energy to electrical and the latter changed electrical energy to mechanical.