A fast charged particle passes perpendicularly through a thin glass sheet of index of refraction 1.5. The particle emits light in the glass. The minimum speed of particle is
A. 1/3 c
B. 4/9 c
C. 5/9 c
D. 2/3 c
E. c
(GR9277 #69)
Solution:
Index of refraction, n = c/v
n = 1.5 = 3/2
v = c/n = 2/3 c
Answer: D
No comments :
Post a Comment