Specifications for Wratten Filters Wratten Filter No. Minimum Wavelength Maximum

Question

Specifications for Wratten Filters

Wratten Filter No. Minimum Wavelength Maximum Frequency 15 521 16 528 21 541 22 557 25 585 29 610

How can Planck's constant be deduced from the graph of stopping potential vs frequency of light in the "Introduction"? How can the work function be obtained from this graph? Calculate the frequencies corresponding to the cut-off wavelengths for the filters in the table in the "Introduction" that provides specifications for the wratten filters (take the speed of light as 3.00 times 108 m s-1)

Explanation / Answer

a)

eV=h( f - fo)
where V is the stopping potential
f= frequency of the incident beam
fo=Threshold frequency (caracteristic of the surface on which the photoelectris effect take place)

hence

plancks constant (h) is is the slope of the curve in graph

b)

frequency = velocity/wavelength

hence

you have not mentioned units of wavelenth

if units are nanometer

frequency = 3x10^8 / 521x10-9 =

frequency = 3x10^8 / 528 x10-9=

frequency = 3x10^8 / 541 x10-9=

frequency = 3x10^8 / 557 x10-9=

frequency = 3x10^8 / 585 x10-9=

frequency = 3x10^8 / 610 x10-9=

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