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Energy required to stop the ejection of electron from metal plate is 0.24 eV . Calculate work function , when radiation of wavelength 662 nm strikes the plate ?

Asked by arunavamitra50 18th June 2018, 6:41 PM
Answered by Expert
Answer:
Given : 
 
Wavelengght = 662 nm
 
Energy space of space photon space equals space work space function space 1 half mu squared

Energy space of space photon space equals work space function space eν subscript ring operator space space space space space minus negative negative negative space open parentheses 1 close parentheses

Where comma
straight e space equals space electronic space charge

straight nu subscript ring operator equals stopping space potential

eν subscript ring operator equals space energy space required space to space stop space the space ejection space of space electron

straight E subscript photon space equals space hc over straight lambda

space space space space space space space space space space space space equals fraction numerator 6.625 cross times 10 to the power of negative 34 end exponent space cross times space 3 cross times 10 to the power of 8 over denominator 662 cross times 10 to the power of negative 9 end exponent end fraction

space space space space space space space space space space space space space equals 3.0 cross times 10 to the power of negative 19 end exponent space space straight J

space space space space space space space space space space space space space equals fraction numerator 3.0 cross times 10 to the power of negative 19 end exponent over denominator 1.602 cross times 10 to the power of negative 19 end exponent end fraction

space space space space space space space space space space space space equals 1.87 space eV

From space eq space open parentheses 1 close parentheses

1.87 space equals space work space function space plus space 0.24

Work space function space equals space 1.87 space minus space 0.24

space space space space space space space space space space space space space space space space space space space space space space equals space 1.63 space eV
Answered by Expert 19th June 2018, 10:16 AM
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