Match the detector with its description. A reverse bias is applied to a pn junction, which acts as a capacitor. Light strikes the surface, and holes and electrons are created which move towards the opposite charge. Accelerated electrons are emitted from a photosensitive surface and strike a second surface, knocking more than one electron from that surface and towards another surface. This process is repeated until there are more than 10% electrons collected per photon that strikes the first surface. A two-dimensional array of pn junctions that stores electrons until they are read sequentially with a very high quantum efficiency. photomultiplier tube Answer Bank charge coupled device photodiode array

The threshold frequency vo describes the smallest light frequency capable of ejecting electrons from a metal. Determine the minimum energy Eo of a photon capable of ejecting electrons from a metal with vo = 5.81 x 1014 s-1. Eo = What is the maximum kinetic energy KEelectron of electrons ejected from this metal by light with a wavelength of 265 nm? KEelectron

When light of wavelength, 410 nm, shines on the surface of metal A and photoelectrons are emitted. However, when metal B is irradiated with light of the same wavelength, no photoelectrons are produced. What is the most likely explanation for these observations?

If an atom has an emission line at a given shade of color (e.g., hydrogen at 656 nm), then does that atom have an absorption line at that same shade of color? Use the slider button under the label km/s to change the speed of the glowing object: negative speeds for objects approaching us, and positive speeds for objects recessing from us.  Describe changes to each of the continuous spectrum, emission line spectrum, and absorption line spectrum as the speed changes.  This change is called the Doppler effect, and is essential for measuring the speeds of objects located at a distance. Suppose you were given a spectrum of a planet.  The spectrum has a collection of absorption lines.  Describe how you would use this simulation to identify what lines were present (or absent) in the spectrum, and therefore what atoms were present (or absent) on the planet.