Plancks Constant Kit Manufacturer,Supplier and Exporter in India
Product Code : EL-AS-10841
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Product Description
Plank's Constant kit can be used:
As a direct method that gives a reasonable order of magnitude value for Planck's constant, h
For the demonstration of photoelectric effect and the principle of applying a backing potential difference to reduce the anode current to zero
This apparatus enables values of V to be found for various frequencies of light selected by placing each of the colour filters in turn over the cell.
A plot of V vs. f gives a reasonable straight line where the gradient is h/e.
The potential difference from an internal PP3 (6F22)-type cell can be adjusted to a value V where the anode current is just reduced to zero.
V is proportional to the frequency of light used.
The Planck's Constant Kit contains a photoelectronic unit, with six colour filters and a BNC to 4mm plug lead.
The main unit contains a photo emissive Caesium Antimony cathode, with a spectral response of 185-650nm.
When light of frequency, f, strikes the cathode, electrons of energy E=hf-W0 are released and would normally reach the anode, producing a current which can be registered on a very sensitive instrument such as a Picoammeter or an Electrometer.
Items in the kit are available separately, and also a set of three narrow band filters for mercury violet, green and yellow lines from the spectrum of a mercury discharge lamp.
These give a similar graph of the same gradient.
Contents include one of each of the following (which are also available separately):
Planck's Constant Unit with screened lead
Colour Filters set of six
Set of 3 Narrow band filters
Plus the following metering:
Easy-Read Meter
20V d.c. Attachment
Spacesaver Picoammeter
PP3 Battery available separately
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Plancks Constant Kit Manufacturer and supplier in India
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