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12PHYSICS WAVES SAC

Victorian Certificate of Education

2017

NAME:______TEACHER: ______

Physics

School Assessed Coursework: Test
Wave Model of Light

Reading Time: 10 minutes

Writing time: 60 minutes

QUESTION AND ANSWER BOOK

Section / Number of
questions / Number of questions
to be answered / Number of marks
A / 6 / 6 / 32

Area of study – Wave Model for Light

Question 1 (9 marks)

The following graph shows the displacement of a Nitrogen molecule in the air as a sound wave passes through it at 340 m s-1.

a.State the amplitude of the sound wave. 1 mark

b.Find the frequency of the sound wave.1 mark

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c.Calculate the wavelength of the sound wave.1 mark

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d.Is the wave Longitudinal or Transverse.1 mark

e.Will the sound wave diffract if it travels through an aperture of 1.0 m. Explain your answer and include a calculation. 3 marks

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A student is moving towards the source of the sound wave.

f.Describe how the period of sound wave as measured by the student compares to period of the sound wave as measured by a stationary observer. 2 marks

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Question 2(3 marks)

Consider a red laser produces a wavelength of 650 nm.

a.Calculate the frequency of the light produced by the laser.1 mark

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b.Compare the wavelength and speed of the laser light to that of infrared light.2 marks

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Question 3 (8 marks)

Consider a green laser light travelling from water into air at an angle of 52o to the boundary.

a.On the diagram above, draw a ray to illustrate the direction and angle of light exiting the water.1 mark

b.Calculate the angle to the normal the light exits the water.2 marks

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c.Calculate the critical angle and explain what happens if the critical angle is surpassed by the incident light. 3 marks

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d.Calculate the speed of the green light when it is travelling in the water.2 marks

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Question 4 (6 marks)

James points a green laser with a frequency of 5.55 1014 Hz at a double slit and observes the pattern below on a screen.

a.Calculate the wavelength of the green laser. 1 mark

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b.Calculate the path difference from the slits to the third bright, X, from the central maximum.1 mark

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c.James exchanges the laser with one of frequency 4.85 1014 Hz.

Describe the effect that this change will have on the pattern.1 mark

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d.Explain how Young’s double slit experiment provides evidence for the wave nature of light.3 marks

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Question 5 (4 marks)

Consider a mix of blue and red light entering a diamond at angle of 15o to the normal.

a.On the Diagram draw and label the rays to represent both red and blue 2 marks

b.Explain why red and blue light disperse in the diamond. 2 marks

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Question 6(2 marks)

Explain the how polarised sunglasses protect and improve the vision for a snow skier on a sunny day.

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END OF OUTCOME 2