Q. 123.6( 58 Votes )

Electrons are emi

Answer :

Given:

Wavelength, λ = 6800 Å


To find threshold frequency, vo:


We know the following basic relation,


Speed of Light = [Frequency] × [Wavelength]


We know speed of light = 3×108 m/s


Frequency, vo = [3×108] / [6800 × 10-10]


vo = 4.412×1014 Hz


Work Function, W0 = [6.626×10-34] × [4.412×1014]


= 2.923×10-19 J


Therefore, the threshold frequency is 4.41×1014 Hz and the work function is 2.92×10-19 J.


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