Physics question 4 hw 21

Physics
Tutor: None Selected Time limit: 1 Day

The work function for a particular metal is 4.0 eV. Which one of the following best describes the wavelength of electromagnetic radiation needed to eject electrons from this metal?
Question 4 options:
Jul 15th, 2015

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wave length =4.0ev*10*3000=

will answer just a small problem

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Jul 15th, 2015

convert ev  to s-1

4.0*106 s-1=0.4*107 s-1

use lamda v =c

(y)(0.4*107 s-1)=3.00*108m/s

y=620nm or greater

Jul 15th, 2015

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