Q9 of 59 Page 393

One of the following wavelengths is absent and the rest are present in the X-rays coming from a Coolidge tube. Which one is the absent wavelength?

In a Coolidge tube, all wavelengths above cut-off wavelength are present. Thus, 25pm is the cut-off minimum wavelength and is absent.

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7

Frequencies of Kα X-rays of different materials are measured. Which one of the graphs in figure may represent the relation between the frequency v and the atomic number Z.

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The X-ray beam coming from an X-ray tube

 10

Figure shows the intensity-wavelength relations of X-rays coming from two different Coolidge tubes. The solid curve represents the relation for the tube A in which the potential difference between the target and the filament is VA and the atomic number of the target material is ZA. These quantities are VB and ZB for the other tube. Then,

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 11

50% of the X-ray coming from a Coolidge tube is able to pass through a 0.1 mm thick aluminum foil. If the potential difference between the target and the filament is increased, the fraction of the X-ray passing through the same foil will be