Post-UTME Physics 2019 Objective — Question 10
Question 10 of 20 from the Post-UTME Screening (Post-UTME) Physics 2019 Objective paper, with the correct answer and a full explanation.
Advertisement
Thermionic emission can occur when
- A. a metal is bombarded by alpha particles
- B. ultra-violet light falls on a metal plate
- C. certain metals are heated to a very high temperatureCorrect
- D. X-rays fall on a hot surface
Explanation
Thermionic emission is the release of electrons from a heated metal surface when it is heated to a sufficiently high temperature.
Advertisement
Sign up free to unlock
- Score tracking
- Practice history
- Saved questions
- Progress dashboard
- Personalized sessions
- Weak-topic breakdown
…and/or go further with premium services and No Ads.