Which of the following phenomena is observed when black discharge occu

1.	Which of the following phenomena is observed when black discharge occurs in a discharge tube ?
A.	The wall of the tube opposite to the cathode glow
B.	Striations are seen
C.	A glow appears at the cathode
D.	Positive column appears
Answer» B. Striations are seen

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Which of the following phenomena is observed when black discharge occurs in a discharge tube ?

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