Wave-Particle Duality Flashcards
What can these alternating bands of dark band light only be explained using
Waves interfering constructively (when two waves overlap in phase)
Waves interfering destructively (when the two waves are out of phase)
What shows light as a wave
Light produces INTERFERENCE & DIFFRACTION patterns- alternating BANDS of dark and light
What did Einstein think a beam of light as
A series of particle-like photons
What was Louis de bro glide bold suggestion in his phD thesis
If ‘wave-like’ light showed particle properties (photons)
‘Particles’ like electrons should be expected to show wave-like properties
What is the de bro bile equation
Y=h/mv
Y= wavelength (wave-like property) M= mass V= velocity
What shows the wave nature of electrons
Electron diffraction
How are diffraction patterns observed (electrons)
When ACCELERATED ELECTRONS in a VACUUM TUBE INTERACT with SPACES in a GRAPHITE CRYSTAL
According to the wave theory, what happens if the wavelength of the wave is greater
The SPREAD of the lines in the diffraction pattern increases
In electron diffraction experiments, what does a smaller accelerating voltage give? (I.e. Slower electrons)
WIDELY SPACED RINGS
What happens if you increase the electron speed
The DIFFRACTION pattern circles SQUASH together towards the middle
How does all that information fit with the de broglie equation
If the velocity is higher
Wavelength is shorter
Spread of lines smaller/diffraction pattern circles squash together (widely spaced rings)
In general what us the wavelength for electrons accelerated in a vacuum tube about the same size as
ELECTROMAGNETIC WAVES
In the X-Ray part of the spectrum
Do particles show wave-like properties all the time
No
When do you on,y get diffraction
If a particle interacts with an objects of about the same size as it’s de Broglie wavelength
A shorter wavelength gives …. Diffraction effects
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