Physics-
General
Easy

Question

The graph between 1/lambda and stopping potential (V) of three metals having work functions ϕ subscript 1 end subscript comma ϕ subscript 2 end subscript and ϕ subscript 3 end subscript in an experiment of photo–electric effect is plotted as shown in the figure. Which of the following statement(s) is/are correct ? [Here lambda is the wavelength of the incident ray].

  1. Ratio of work functions ϕ subscript 1 end subscript: ϕ subscript 2 end subscript : ϕ subscript 3 end subscript = 1 : 2 : 4.    
  2. Ratio of work functions ϕ subscript 1 end subscript: ϕ subscript 2 end subscript: ϕ subscript 3 end subscript = 4 : 2 : 1.    
  3. tantheta is directly proportional to hc/e, where h is Planck’s constant and c is the speed of light.    
  4. The violet colour light can eject photoelectrons from metals 2 and 3.    

The correct answer is: Ratio of work functions ϕ subscript 1 end subscript: ϕ subscript 2 end subscript : ϕ subscript 3 end subscript = 1 : 2 : 4.

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