AQA A Level Physics 3.2.2.4 Wave-particle duality

Diffraction is a property exhibited by:

• waves

• particles

Interference is a property exhibited by:

• waves

• particles

The photoelectric effect works only for:

• waves

• particles

Electron diffraction is evidence for:

• wave-particle duality

• photoelectric effect

• refraction

• particle behaviour

• reflection

In an electron diffraction tube, the cathode:

• emits electrons

• accelerates electrons

• casts a shadow on the screen

• glows when hit by electrons

• deflects electrons

In an electron diffraction tube, the anode:

• emits electrons

• accelerates electrons

• casts a shadow on the screen

• glows when hit by electrons

• deflects electrons

In an electron diffraction tube, the Maltese cross:

• emits electrons

• accelerates electrons

• casts a shadow on the screen

• glows when hit by electrons

• deflects electrons

In an electron diffraction tube, the fluorescent screen:

• emits electrons

• accelerates electrons

• casts a shadow on the screen

• glows when hit by electrons

• deflects electrons

In an electron diffraction tube, an electric field or a magnet:

• emits electrons

• accelerates electrons

• casts a shadow on the screen

• glows when hit by electrons

• deflects electrons

In an electron diffraction tube:

• Electrons are emitted and accelerated towards a graphite target.

• They diffract through the holes in the crystalline structure.

• Their waves overlap and interfere.

• Creating a pattern on the screen.

• Which depends on the electron velocity and the crystal structure.