What is the largest wavelength for emission of electrons from a photosurface?

AI Thread Summary
The discussion focuses on calculating the largest wavelength of light that can cause electron emission from a photosurface, given a stopping voltage of 1.40V for a wavelength of 2.08*10^-7m. It explores determining the work function using a different wavelength of 2.3*10^-7m and a stopping voltage for a wavelength of 1.8*10^-7m. The relationship between the wavelength of incident light and the energy of emitted electrons is highlighted, referencing the equations for frequency and energy. The user seeks assistance in applying these concepts to solve the problems related to the photoelectric effect. Understanding these principles is crucial for accurately determining the work function and emission thresholds.
prakriti
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1) when light of wavelength 2.08*10^-7m falls on a photosurface, a voltage of 1.40V is required to stop the emitted electrons from reaching the anode. What is the largest wavelength of light that will result in emission of electrons from this photosurface?


2) To determine the work function of given photosurface, light of wavelength 2.3*10^-7 m is directed at the surface and the stopping voltage is recorded. When light of wavelength 1.8*10^-7m large as the previous one. Find the work function.
 
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What is the relationship between the wavelength of the incident light and the energy of the emitted electrons?
 
isnt it f = speed / wavelength
and Energy = h*f
so Energy = h*speed/wavelength
but i just can't figure out the problem.. please help!
 
look up the photoelectric effect
 

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