JAMB Physics 2007 Objective — Question 1
Question 1 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2007 Objective paper, with the correct answer and a full explanation.
Advertisement
A glass plate 0.9cm thick has a refractive index of 1.50. How long does it take for a pulse of light to pass through the plate? [c=3.0x10^8ms-1]
- A. 3.0x10^-11s
- B. 4.5x10^-11sCorrect
- C. 3.0x10^-10s
- D. 4.5x10^-10s
Explanation
Velocity in glass = c/n = 3x10^8/1.5 = 2x10^8m/s. Distance = 0.9cm = 9x10^-3m. Time = distance/speed = 9x10^-3/2x10^8 = 4.5x10^-11s.
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.