Question 17N.2.HL.TZ0.6b.i
| Date | November 2017 | Marks available | [Maximum mark: 3] | Reference code | 17N.2.HL.TZ0.6b.i |
| Level | HL | Paper | 2 | Time zone | TZ0 |
| Command term | Explain, State | Question number | b.i | Adapted from | N/A |
The double slit is replaced by a diffraction grating that has 600 lines per millimetre. The resulting pattern on the screen is shown.
State and explain the differences between the pattern on the screen due to the grating and the pattern due to the double slit.
[3]
fringes are further apart because the separation of slits is «much» less
intensity does not change «significantly» across the pattern or diffraction envelope is broader because slits are «much» narrower
the fringes are narrower/sharper because the region/area of constructive interference is smaller/there are more slits
intensity of peaks has increased because more light can pass through
Award [1 max] for stating one or more differences with no explanation
Award [2 max] for stating one difference with its explanation
Award [MP3] for a second difference with its explanation
Allow “peaks” for “fringes”
