The Double slit experiment. In this slideshow, behaviours of matter, elementary particles, and waves are compared as they are fired through slits.

1. Double Slit Experiment
By: Danilo Veljovic

2.  Matter: Forms a vertical band dictated
by the width and location of the band
 Waves: form something that resembles a
“secondary wave” that originates from
the band
 Electrons: Do something else that is very
interesting

3. Matter being shot through a single slit
- forms a single band on
the wall that that
corresponds to the width
of the slit

4. Waves being shot through a single slit
Waves radiate out as they
hit the slit, with the highest
amplitude right down the
middle
Area with highest
amplitude

5. Matter being shot through two slits
- forms two bands on the wall
that that corresponds to the
width of the slit

6. Waves being shot through two slits
Waves radiate out as they hit the
slits, and create multiple
interferences
Areas of white on the wall
represent constructive
intereference

7. Electrons being shot through one slit
Electrons form a single band when
they are shot through one slit

8. Electrons behave like waves
and therefore form bands
when shot through two slits
Electrons being shot through two slits

9. So do electrons behave as particles
or waves?

10. Wave-Particle Duality
 The concept that elementary particles
behave both as waves and as particles
 In this case, we observe electrons
behaving as particles through a single slit,
but as waves through a double slit

11. A few multiple choice questions

12. 1. When waves are fired through a single
slit, where is the amplitude the highest?
• A: The amplitude is equal everywhere
• B: The amplitude is highest directly in front of the slit
• C: The amplitude gets higher to the sides
• D: It depends on the type of wave

13. 2. Which of the following will form multiple
bands when fired through two slits
• 1: Protons
• 2: Sodium ions
• 3: Electrons
• 4: Light rays
• A: 1
• B: 1,3
• C: 1,3,4,
• D: 1,2,3,4

14. Solutions
• 1: B. The amplitude is of waves fired through a single slit
is highest directly in front of the slit
• 2: C. Both protons and electrons are elementary particles
and will therefore act as waves when fired through two
slits. Light rays are waves and will the refore act as
waves. Sodium ions are matter that is made up of many
subatomic particles, and will not act as a wave.
Pictures taken from:
https://www.youtube.com/watch?v=DfPeprQ7oGc