Q. The mean free path of the electrons in a discharge tube is 20 cm. The length of the tube is 15 cm only. Then length of Crooke’s dark space is
A) 5 cm
B) 20 cm
C) 15 cm
D) 25 cm
Explanation
(c) The length of Crooke’s dark space will be equal to the length of tube $ie,$15cm
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.