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PHYSICS, M7 2024 HSC 2 MC

Which of the following provides evidence for the model of light proposed by Huygens?

  1. Emission spectra
  2. Diffraction of light
  3. Black body radiation
  4. The photoelectric effect
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Show Worked Solution

→ Huygens’s proposed that light was a wave and light waves spread out in all directions as spherical wave fronts from a point source. 

→ Therefore the diffraction of light provided evidence for Huygens model of light as diffraction is a wave phenomena.

 

PHYSICS M7 2022 HSC 27

A laser producing red light of wavelength 655 nm is directed onto double slits separated by a distance, . A screen is placed behind the double slits.
 


 

  1. Newton proposed a model of light. Use a labelled sketch to show the pattern on the screen that would be expected from Newton's proposed model.   (2 marks)
     

     
  2. When the laser light is turned on, a series of vertical bright lines are seen on the screen.
     
 
  1. Calculate the angle, , between the centre line and the bright line at .   (3 marks)
  1. The laser is replaced with one producing green light of wavelength 520 nm.
  2. Explain the difference in the pattern that would be produced.   (2 marks)
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a.   
       

 
b.   

c.   Consider 

→

→ Using light with a shorter wavelength decreases the angular separation of bright fringes.

→ The bright lines will appear closer together.

Show Worked Solution
a.   
     

Mean mark part (a) 53%.

b.   Using 

   
   

 

c.   Consider 

→

→ Using light with a shorter wavelength decreases the angular separation of bright fringes.

→ The bright lines will appear closer together.