Homework 1.69
Posted: Wed Sep 28, 2016 11:52 pm
Question is as follows:
In a recent suspense fi lm, two secret agents must penetrate
a criminal’s stronghold monitored by a lithium photomultiplier
cell that is continually bathed in light from a laser. If the beam
of light is broken, an alarm sounds. The agents want to use a
handheld laser to illuminate the cell while they pass in front
of it. They have two lasers, a high-intensity red ruby laser
(694 nm) and a low-intensity violet GaN laser (405 nm), but
they disagree on which one would be better. Determine
(a) which laser they should use and (b) the kinetic energy of
the electrons emitted. The work function of lithium is 2.93 eV.
I'm not sure how exactly to approach this problem as I'm not sure what qualities would deem a laser as "better"
In a recent suspense fi lm, two secret agents must penetrate
a criminal’s stronghold monitored by a lithium photomultiplier
cell that is continually bathed in light from a laser. If the beam
of light is broken, an alarm sounds. The agents want to use a
handheld laser to illuminate the cell while they pass in front
of it. They have two lasers, a high-intensity red ruby laser
(694 nm) and a low-intensity violet GaN laser (405 nm), but
they disagree on which one would be better. Determine
(a) which laser they should use and (b) the kinetic energy of
the electrons emitted. The work function of lithium is 2.93 eV.
I'm not sure how exactly to approach this problem as I'm not sure what qualities would deem a laser as "better"