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(B) In an $X-$ray tube,the target material must be a heavy element with a high melting point. $1$. $A$ heavy element (high atomic number $Z$) is requi

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$A$ heavy element with a high melting point

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(B) In an $X-$ray tube,the target material must be a heavy element with a high melting point. $1$. $A$ heavy element (high atomic number $Z$) is required to produce high-energy $X-$rays efficiently through the deceleration of electrons (Bremsstrahlung). $2$. $A$ high melting point is essential because a significant portion of the kinetic energy of the incident electrons is converted into heat upon impact with the target. If the melting point were low,the target would melt under continuous operation.

Molybdenum is used as a target element for the production of $X-$rays because it is

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