Consider photoemission caused by ultraviolet light
with a wavelength of 207 nm on a metal surface. The stopping potential module
is 2 V. Determine the extraction work in eV, the maximum velocity of the
ejected electrons, and the photoelectric threshold wavelength.

Data
:

1 eV = 1.6×10 -19 J ; h = 6.626×10 -34
J.s ; c = 3×10 8 m/s ;
m e = 9.109×10 -31 kg ; e =
1.6×10 -19 C

(Tick the right answer, 5 pts , 6 minutes )

Question

Consider photoemission caused by ultraviolet light
with a wavelength of 207 nm on a metal surface. The stopping potential module
is 2 V. Determine the extraction work in eV, the maximum velocity of the
ejected electrons, and the photoelectric threshold wavelength.

Data
:

1 eV = 1.6×10 -19  J   ;   h = 6.626×10 -34 
J.s   ;   c = 3×10 8  m/s   ; 
 m e  = 9.109×10 -31  kg   ;   e =
1.6×10 -19  C

(Tick the right answer,  5 pts  ,  6 minutes )

Answer

W 0 
= 2.93 eV   ;   v = 6.77×10 5  m/s 
 ;    λ 0  = 400 nm

Answer

W 0 
= 1.93 eV   ;   v = 3×10 5  m/s 
 ;   λ 0  = 600 nm

Answer

W 0 
= 2.83 eV   ;   v = 3.14×10 5  m/s 
 ;    λ 0  = 400 nm

Answer

W 0 
= 3.0 eV   ;   v = 5.77×10 5  m/s 
 ;    λ 0  = 500 nm

Answer

W 0  = 4.01 eV   ;   v = 8.38×10 5 
m/s   ;    λ 0  = 310 nm

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Consider photoemission caused by ultraviolet light with a wavelength of 207 nm o...

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