A photomultiplier tube (a very sensitive light sensor), isbased on the photoelectric effect: incident photons strike ametal surface and the resulting ejected electrons arecollected. By counting the number of collected electrons,the number of incident photons (i.e., the incident lightintensity) can be determined. (a) If a photomultiplier tubeis to respond properly for incident wavelengths throughout the visible range (410 nm to 750 nm), what is themaximum value for the work function W0 (eV) of its metalsurface? (b) If W0 for its metal surface is above a certainthreshold value, the photomultiplier will only function forincident ultraviolet wavelengths and be unresponsive tovisible light. Determine this threshold value (eV).
Compton effect
The incoming photons' energy must be in the range of an X-ray frequency to generate the Compton effect. The electron does not lose enough energy that reduces the wavelength of scattered photons towards the visible spectrum. As a result, with visible lights, the Compton effect is missing.
Recoil Velocity
The amount of backward thrust or force experienced by a person when he/she shoots a gun in the forward direction is called recoil velocity. This phenomenon always follows the law of conservation of linear momentum.
A photomultiplier tube (a very sensitive light sensor), is
based on the
metal surface and the resulting ejected electrons are
collected. By counting the number of collected electrons,
the number of incident photons (i.e., the incident light
intensity) can be determined. (a) If a photomultiplier tube
is to respond properly for incident wavelengths throughout the visible range (410 nm to 750 nm), what is the
maximum value for the work function W0 (eV) of its metal
surface? (b) If W0 for its metal surface is above a certain
threshold value, the photomultiplier will only function for
incident ultraviolet wavelengths and be unresponsive to
visible light. Determine this threshold value (eV).
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