Topic 22

Question 1

What is the wave property of matter?

Answer 1

Matter has wave properties like light

Question 2

Equation of De Broglie’s wavelength of a particle.

Answer 2

λ = h/p

• h = Planck’s Constant*
• p = momentum*

Question 3

Describe the electron microscope

Answer 3

Small wavelenght of electrons to produce an image.

Shhots electrons on object with electron gun.

Uses magnetic lenses

Question 4

Describe the wavelength of an electron accelerated by an electric potential difference

Which equation shows this?

Answer 4

The initial electric potential energy (eU) of an electron should be equal to its kinetic energy.

Question 5

Describe the transmission electron microscope

Answer 5

Thin sample

Excellent resolution

Stain with heavy metals

Microscope must be in a vacuum

Magnetic lenses are always converging

Question 6

Describe the scanning electron microscope

Answer 6

Electrons shoot at small spot and are swept accross the sample

Electron detector counts electrons knocked out of the sample

3D structure seen