Flashcards
Wave-Particle Duality
Flashcards do conjunto (8)
- 1What is the Broglie Wavelength equation?λ = h/mv
Brogile Wavelength = Planck constant / mass x velocity (momentum) - 2Charge x Voltage is equal to....1/2mv^2
(QV = 1/2mv^2) - 3Electron gun diagram :
- 4If the voltage across the electron gun is increased, what will happen to the diffraction pattern?As QV = 1/2 mv^2 , v^2 α V , so v increases
As λ = h/mv , λ α 1/v , so λ decreases
As λ is smaller, there is less diffraction so the rings are closer together - 5How scientists understanding of the nature of matter has changed:De Broglie observed light waves and particle characteristics then hypothesised wave-particle duality
His theory wasn't accepted straight away
Other scientists evaluated De Broglies theory..... by peer review
Then De Broglie published his theory
They theory was tested with experiments
One there was enough evidence, the theory was validated by the scientific community - 6What happens to the diffraction pattern (rings) when the speed of the electrons increase?The speed increasing is the same as frequency increasing, so therefore wavelength gets shorter so less diffraction. The pattern (rings) will be closer together
- 7How did the electron gun experiment demonstrate the wave-like nature of electrons?Broglies wavelength = Planck constant / mass x velocity
Electrons propagate as a wave
Electrons are diffracted when their wavelength is less than or comparable to the size of the atoms - 8How does the electron gun experiment provide evidence for the particle like property of electrons?Electrons have mass