1.A ray of red light enters a semi-circular glass block normal to the curved surface.Which diagram correctly shows the partial reflection and refraction of the ray?

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2. A ripple tank is used to demonstrate refraction of plane water waves

 

2

Waves in deep water have a wavelength of 1.2 cm and a speed of 9.6 cm / s. The wavelength of the waves in shallow water is 0.8 cm. What is the speed of the waves in the shallow water?

 
 
 
 

3. The diagram shows a ray of light travelling from X. Angle P is less than the critical angle. In which direction does the ray continue?

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4. The diagram shows the refraction of water waves in a ripple tank. The water is shallower above the glass sheet.

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When crossing into the shallower region, what is the effect on the frequency and on the speed of the waves?

 

 
 
 
 

5. A ray of light passes into a glass block of refractive index 1.5.

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What is the value of the angle marked X?

 

A.   19.50

B.   25.00

C.   35.30

D.   48.60

 

 
 
 
 

6. When a wave crosses the boundary between two media, which one of the following properties of the wave does not change?

 
 
 
 

7. On which one of the following graphs is the wavelength ë and the amplitude a of a wave correctly represented?

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8. The variation with time t of the separate displacements d of a point in a medium due to two waves is shown below.

8A

The waves are superposed. Which of the following diagrams shows the variation with time t of the resultant displacement d of the point in the medium?

8B

 
 
 
 

9. . Sound waves move faster in warm air than in cold air. The diagram below shows plane waves in cold air moving towards a boundary with warm air.

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Which of the arrows shows the possible direction of waves after reaching the boundary?

 
 
 
 

10. . Which diagram best shows diffraction of plane wavefronts at a single slit?

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