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Question
Which of the following can be done to avoid loss of intensities of X-rays due to the absorption of long wavelength X-rays?
Options:
A .  Apparatus must be contained in a chamber
B .  Air in the chamber must be replaced by helium
C .  Inert gas atmosphere must be provided
D .  Proper slits must be used
Answer: Option B
Answer: (b).Air in the chamber must be replaced by helium

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