A photon has energy of 4.20 eV. To what wavelength does this ...

[vHAUNG6011]

A photon has energy of 4.20 eV. To what wavelength does this energy correspond?
 
  A)
 
  321 nm
  B)
 
  103 nm
  C)
 
  296 nm
  D)
 
  412 nm
  E)
 
  420 nm

Question 2

What is the meaning of the term critical mass?
 
  A)
 
  This refers to the mass of the critical elements in a reactor, i.e., the uranium or plutonium.
  B)
 
  This refers to the minimum amount of fissionable material required to sustain a chain reaction.
  C)
 
  This refers to the maximum amount of fissionable material required to sustain a chain reaction.
  D)
 
  This is the amount of mass needed to make a power reactor economically feasible.
  E)
 
  This is the material which is just on the verge of becoming radioactive.

[dellikani2015]

Answer to Question 1

C

Answer to Question 2

B

[vHAUNG6011]

Excellent

[xiaomengxian]

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