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An X – ray tube operating at 84 kV & 10 mA. Only 1% of the electric power supplied is converted into X – rays. If target has a mass of 300 gm & specific heat of $0.04 c a l / g m /^{0} C .$ Then choose the correct statements (use 1 cal = 4.2 J & hc = 12400 eV – A) Assume entire thermal energy is absorbed by the target.

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cut – off wavelength is approximately 0.15 A

cut – off wavelength is approximately 6.8 A

average rate of temperature rise of target (assuming no heat loss) is ${16.5}^{0} C / s e c$

average rate of temperature rise of target (assuming no heat loss) is ${1.7}^{0} C / s e c$

answer is A, C.

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Detailed Solution

$λ = h c / e V$ and $0.99 V I = m s \frac{d θ}{d t}$

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