Apparatus:
Braun
electroscope,
rubber
rod,
fur,
UVA/B
source
Description:
Using
the
rubber
rod
and
fur,
negative
charge
is
transferred
to
the
electrosope.
Exposing
the
electroscope
to
UVB
causes
the
electroscope
to
lose
its
charge.
A
pane
of
glass
my
be
used
to
block
the
UVB.
PIRA 7A10.10
This equipment may ablso be used to show photoelectric charging. With the clean zinc plate on an uncharged electroscope and illuminated with the UV light, a glass rod rubbed with silk may be used to charge the electroscope by induction.
PIRA 7A10.12