Wave nature of electrons and de Broglie wavelength Quiz
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5 questions, one answer each
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1. What does the ring pattern from electrons passing through graphite show?
- A. Electrons have a negative charge
- B. Electrons can behave as waves
- C. Graphite contains free electrons
- D. Electrons are all the same speed
2. Which equation gives the de Broglie wavelength?
- A. λ = hp
- B. λ = p / h
- C. λ = h / p
- D. λ = h / p²
3. An electron's momentum is quadrupled. What happens to its de Broglie wavelength?
- A. It falls to one quarter
- B. It falls to one half
- C. It rises by a factor of 4
- D. It is unchanged
4. Why are tennis balls not seen to diffract?
- A. They carry no charge
- B. Their momentum is so large that λ is extremely small
- C. They are not made of atoms
- D. They travel too slowly to have a wavelength
5. Why does an electron microscope resolve finer detail than a light microscope?
- A. Electrons are heavier than photons, so they are deflected more
- B. Electrons are charged and attract the sample
- C. Electrons can have a much shorter wavelength
- D. Electrons travel faster than light