Wave Particle Duality

Question 1

Light has wave like properties

Answer 1

Interference and diffraction.

Question 2

Light has particle properties

Answer 2

Photoelectric effect

Question 3

De Broglie’s Theory

Answer 3

That particles have wave like properties.
Confirmed when electrons were used to image crystals and evidence of electron diffraction was observed

Question 4

Electron Diffraction

Answer 4

Distance increases if wavelength increases.

Small accelerating p.d. means electrons with lower momentum.

Wavelength inversely proportional to momentum.

If voltage increases, distance decreases.

For diffraction to occur, the gap size needs to be approximately equal to the De Broglie

Question 5

Equation

Answer 5

Lambda = h/sqrt(2meV)

m = mass of particle
e = charge of particle
V = accelerating P.D