College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000



College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
Textbook Problem

Unreasonable Results

Red light having a wavelength of 700 nm is projected onto magnesium metal to which electrons are bound by 3.68 eV. (a) Use KE e = h f BE to calculate the kinetic energy of the ejected electrons. (b) What is unreasonable about this result? (c) Which assumptions are unreasonable or inconsistent?


To determine

The kinetic energy of the ejected electrons.



Wavelength of light =λ=700 nm = 700 × 109 m

Frequency of light =f

Binding energy of metal =BE=3.68 eV

Binding energy =BE

Speed of light =c=3 ×108 ms1 

Kinetic energy of ejected electrons =KE

Formula Used:

Frequency is given as,


Energy of light is given as,


Kinetic energy of the ejected electrons is given as,



Frequency is given as,


Inserting the values



To determine

The factor that unreasonable about the result in part (a).


To determine

The assumption which is unreasonable or inconsistent.

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