Post-UTME Physics 2015 Objective — Question 5
Question 5 of 20 from the Post-UTME Screening (Post-UTME) Physics 2015 Objective paper, with the correct answer and a full explanation.
Advertisement
The work function of a certain metal is 2.1 eV. Calculate the minimum energy required to remove an electron from the metal surface. [1eV = 1.6 x 10-19C]
- A. 3.36 x 10^-19JCorrect
- B. 4.20 x 10^-19J
- C. 5.20 x 10^-19J
- D. 6.36 x 10^-19J
Explanation
Energy = 2.1 x 1.6x10^-19 = 3.36x10^-19J.
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.