For a certain multiple-slit barrier the slit separation is 4 times the slit width. For this system: 

A. the orders of the lines that appear are all multiples of 4 

B. the orders of lines that appear are all multiples of 2 

C. the orders of the missing lines are all multiples of 4 

D. the orders of the missing lines are all multiples of 2 

E. none of the above are true

A mixture of 450-nm and 900-nm light is incident on a diffraction grating. Which of the following is true? 

A. all lines of the 900-nm light coincide with even order lines of the 450-nm light 

B. all lines of the 450-nm light coincide with even order lines of the 900-nm light 

C. all lines of the 900-nm light coincide with odd order lines of the 450-nm light 

D. None of the lines of the 450-nm light coincide with lines of the 900-nm light 

E. All of the lines of the 450-nm light coincide with lines of the 900-nm light

X rays are: 

A. electromagnetic waves 

B. negatively charged ions 

C. rapidly moving electrons 

D. rapidly moving protons 

E. rapidly moving neutrons

Binoculars and microscopes are frequently made with coated optics by adding a thin layer of transparent material to the lens surface as shown. One wants:

A. constructive interference between waves 1 and 2 

B. destructive interference between waves 3 and 4 

C. constructive interference between 3 and 4 

D. the coating to be more transparent than the lens 

E. the speed of light in the coating to be less than that in the lens

No fringes are seen in a single-slit diffraction pattern if: 

A. the screen is far away 

B. the wavelength is less than the slit width 

C. the wavelength is greater than the slit width 

D. the wavelength is less than the distance to the screen 

E. the distance to the screen is greater than the slit width

A light spectrum is formed on a screen using a diffraction grating. The entire apparatus (source, grating and screen) is now immersed in a liquid of refractive index 1.33. As a result, the pattern on the screen: 

A. remains the same 

B. spreads out 

C. crowds together 

D. becomes reversed, with the previously blue end becoming red 

E. disappears because the refractive index isn’t an integer

In a Young’s experiment, it is essential that the two beams: 

A. have exactly equal intensity 

B. be exactly parallel 

C. travel equal distances 

D. come originally from the same source 

E. be composed of a broad band of frequencies

A diffraction pattern is produced on a viewing screen by illuminating a long narrow slit with light of wavelength λ. If the slit width is decreased and no other changes are made: 

A. the intensity at the center of the pattern decreases and the pattern expands away from the bright center 

B. the intensity at the center of the pattern increases and the pattern contracts toward the bright center 

C. the intensity at the center of the pattern does not change and the pattern expands away from the bright center 

D. the intensity at the center of the pattern does not change and the pattern contracts toward the bright center 

E. neither the intensity at the center of the pattern nor the pattern itself change

Yellow light is viewed by reflection from a thin vertical soap film. Let λ be the wavelength of the light within the film. Why is there a large dark space at the top of the film?

A. no light is transmitted through this part of the film 

B. the film thickness there is λ/4 

C. the film thickness there is much less than λ 

D. the film is too thick in this region for thin film formulas to apply 

E. the reflected light is in the infrared

In a Young’s double-slit experiment, the slit separation is doubled. This results in: 

A. an increase in fringe intensity 

B. a decrease in fringe intensity 

C. a halving of the wavelength 

D. a halving of the fringe spacing 

E. a doubling of the fringe spacing