124 ❇01 July 2011 ❇ Name:

1. 
   ______________ The hydrogen gas spectrum is seen in the image on the left. Is this a continuous or discrete sprectrum?
2. ______________ The lines from left to right are red, cyan, and purple. Which of these three has the longest wavelength (which is the same as saying "the lowest frequency")?
3. ___________________ What is the box-like object in the picture with the candle called?
   
4. _____ A laser is beamed into a semi-circular dish of water. Will the light come out at A or B?
   
5. In the diagram, draw the path of a light ray from the penny to the eye.
   
6. Plot the data below on the graph provided and draw a linear best fit line through the data points on the graph.
   
   1. ______________ Calculate the slope of the linear best fit line. The slope is the experimental index of refraction for the material.
   2. ______________ The above material is reported to have a theoretic index of refraction of 1.33. What is the percentage error for the slope you calculated based against a theoretic value of 1.33?
7. __________________ When spear fishing in shallow water on the reef, does the experienced spear fisher aim above or below the fish that he sees in the water?

[$\text{slope m}=\frac{(\mathrm{y2}-\mathrm{y1})}{(\mathrm{x2}-\mathrm{x1})}$] [ $\Delta \%=\frac{(\text{observed}-\mathrm{predicted})}{\mathrm{predicted}}$ ]