Physics 201 Final Exam Questions With
Correct Questions
Light |waves |are |__________ |waves. |- |CORRECT |ANSWER✔✔-electromagnetic
States |that |both |the |wave |and |particle |aspects |of |light |are |fundamental |to |its |nature. |- |
CORRECT |ANSWER✔✔-Principle |of |Complementarity
The |ratio |of |the |speed |of |light |in |vacuum |to |the |apparent |speed |of |light |in |the |medium, |n=c/v.
|- |CORRECT |ANSWER✔✔-Index |of |Refraction
Does |the |frequency |of |a |wave |change |as |the |wave |moves |from |one |medium |to |another? |- |
CORRECT |ANSWER✔✔-No, |as |the |wave |speed |changes, |the |wavelength |must |change |as |well.
The |interference |occurs |because |points |on |the |screen |are |not |necessarily |the |same |distance |
from |both |slits. |If |the |path |length |difference |is |an |integer |number |of |wavelengths |the |waves |
arrive |in |phase |and |interfere |constructively |(bright |spot). |If |the |difference |is |an |odd |integer |
number |of |half |wavelengths |the |waves |arrive |completely |out |of |phase |and |interfere |
destructively |(dark |spot). |- |CORRECT |ANSWER✔✔-Double-Slit |Interference
If |the |distance |to |the |screen |is |much |greater |than |the |distance |between |the |slits, |the |two |
waves |are |almost |________ |and |the |difference |in |path |length |is |delta(r)=dsin(theta). |- |
CORRECT |ANSWER✔✔-parallel
Consists |of |a |large |number |of |equally |spaced |narrow |slits |or |lines. |- |CORRECT |ANSWER✔✔-
Diffraction |Grating
, A |__________ |grating |has |slits, |while |a |__________ |grating |has |lines |that |reflect |light. |- |
CORRECT |ANSWER✔✔-transmission; |reflection
A |light |wave |travels, |as |a |plane |wave, |from |air |(n |= |1.00) |to |glass |(n |= |1.50). |- |CORRECT |
ANSWER✔✔-Since |the |wave |speed |decreases |and |the |frequency |doesn't |change, |the |
wavelength |must |decrease.
A |laser |beam |is |incident |on |a |pair |of |narrow |slits |and |an |interference |pattern |is |formed |on |a |
distant |screen. |When |the |distance |between |the |slits |increased, |the |distance |between |the |
interference |fringes
A. |decreased. |
B. |remained |the |same. |
C. |increased. |- |CORRECT |ANSWER✔✔-A
For |a |point |between |a |dark |spot |and |a |bright |spot |there |will |be |
A. |no |interference. |
B. |partially |constructive |interference. |
C. |partially |destructive |interference. |
D. |Both |B |and |C. |
E. |Either |B |or |C. |- |CORRECT |ANSWER✔✔-E |(Since |waves |interfere |wherever |they |overlap)
A |few |wavelengths |thick |- |light |will |reflect |from |both |the |bottom |and |the |top |of |the |layer, |
causing |interference. |This |can |be |seen |in |soap |bubbles |and |oil |slicks. |- |CORRECT |ANSWER✔✔-
Thin |Film
A |soap |film |is |illuminated |with |white |light |and |shows |interference |fringes. |The |top |of |the |film, |
where |it |is |very |thin, |is |dark. |Where |the |film |is |dark, |is |the |interference |of |the |two |reflected |
waves |constructive |or |destructive?
A. |Constructive.
Correct Questions
Light |waves |are |__________ |waves. |- |CORRECT |ANSWER✔✔-electromagnetic
States |that |both |the |wave |and |particle |aspects |of |light |are |fundamental |to |its |nature. |- |
CORRECT |ANSWER✔✔-Principle |of |Complementarity
The |ratio |of |the |speed |of |light |in |vacuum |to |the |apparent |speed |of |light |in |the |medium, |n=c/v.
|- |CORRECT |ANSWER✔✔-Index |of |Refraction
Does |the |frequency |of |a |wave |change |as |the |wave |moves |from |one |medium |to |another? |- |
CORRECT |ANSWER✔✔-No, |as |the |wave |speed |changes, |the |wavelength |must |change |as |well.
The |interference |occurs |because |points |on |the |screen |are |not |necessarily |the |same |distance |
from |both |slits. |If |the |path |length |difference |is |an |integer |number |of |wavelengths |the |waves |
arrive |in |phase |and |interfere |constructively |(bright |spot). |If |the |difference |is |an |odd |integer |
number |of |half |wavelengths |the |waves |arrive |completely |out |of |phase |and |interfere |
destructively |(dark |spot). |- |CORRECT |ANSWER✔✔-Double-Slit |Interference
If |the |distance |to |the |screen |is |much |greater |than |the |distance |between |the |slits, |the |two |
waves |are |almost |________ |and |the |difference |in |path |length |is |delta(r)=dsin(theta). |- |
CORRECT |ANSWER✔✔-parallel
Consists |of |a |large |number |of |equally |spaced |narrow |slits |or |lines. |- |CORRECT |ANSWER✔✔-
Diffraction |Grating
, A |__________ |grating |has |slits, |while |a |__________ |grating |has |lines |that |reflect |light. |- |
CORRECT |ANSWER✔✔-transmission; |reflection
A |light |wave |travels, |as |a |plane |wave, |from |air |(n |= |1.00) |to |glass |(n |= |1.50). |- |CORRECT |
ANSWER✔✔-Since |the |wave |speed |decreases |and |the |frequency |doesn't |change, |the |
wavelength |must |decrease.
A |laser |beam |is |incident |on |a |pair |of |narrow |slits |and |an |interference |pattern |is |formed |on |a |
distant |screen. |When |the |distance |between |the |slits |increased, |the |distance |between |the |
interference |fringes
A. |decreased. |
B. |remained |the |same. |
C. |increased. |- |CORRECT |ANSWER✔✔-A
For |a |point |between |a |dark |spot |and |a |bright |spot |there |will |be |
A. |no |interference. |
B. |partially |constructive |interference. |
C. |partially |destructive |interference. |
D. |Both |B |and |C. |
E. |Either |B |or |C. |- |CORRECT |ANSWER✔✔-E |(Since |waves |interfere |wherever |they |overlap)
A |few |wavelengths |thick |- |light |will |reflect |from |both |the |bottom |and |the |top |of |the |layer, |
causing |interference. |This |can |be |seen |in |soap |bubbles |and |oil |slicks. |- |CORRECT |ANSWER✔✔-
Thin |Film
A |soap |film |is |illuminated |with |white |light |and |shows |interference |fringes. |The |top |of |the |film, |
where |it |is |very |thin, |is |dark. |Where |the |film |is |dark, |is |the |interference |of |the |two |reflected |
waves |constructive |or |destructive?
A. |Constructive.
