Cathode rays are produced when the pressure is of the order of
Cathode rays are produced when the pressure is of the order of
- A
$2 cm$ of $Hg$
- B
$0.1 cm$ of $Hg$
- C
$0.01 mm$ of $Hg$
- D
$1$ $\mu m$ of $Hg$
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- [AIPMT 2002]
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