Ionisation, excitation and the electronvolt Quiz
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5 questions, one answer each
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1. What is 2.5 eV in joules?
- A. 1.6 × 10⁻¹⁹ J
- B. 4.0 × 10⁻¹⁹ J
- C. 6.3 × 10¹⁸ J
- D. 1.6 × 10⁻²⁰ J
2. An electron with a kinetic energy of 6.0 eV collides with a mercury atom (lowest excitation energy 4.9 eV). What kinetic energy does it have afterwards if it excites the atom to its first excited level?
- A. 0 eV
- B. 1.1 eV
- C. 4.9 eV
- D. 10.9 eV
3. In a fluorescent tube, what is the role of the phosphor?
- A. To ionise the mercury atoms
- B. To accelerate electrons
- C. To absorb ultraviolet photons and emit visible photons
- D. To conduct electricity
4. Which process removes an electron completely from an atom?
- A. Excitation
- B. De-excitation
- C. Ionisation
- D. Elastic collision
5. A photon of energy 3.2 × 10⁻¹⁹ J has what energy in eV?
- A. 2.0 eV
- B. 0.50 eV
- C. 5.1 eV
- D. 3.2 eV