When the pressure of the gas in a discharge tube is gradually lowered. I. there is a violet glow in the tube II. the glow in the tube splits into bands which get further apart. III, the glow and the bands eventually disappear and there is a green fluorescence in the tube. IV. the tube breaks into pieces. Which of the following are correct?

A. I and II only
B. I and III only  
C. I and IV only
D. I, II and III only
E. I, II III and IV

Show Answer Show Explanation

Correct Answer: B