An X-ray tube is operating at 50 kV and 10 mA. The target material of the tube has mass of 1 kg and specific heat 495 J kg⁻¹°C⁻¹. One percent of applied electric power is converted into X-rays and the remaining energy goes into heating the target. Then :
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Question

An X-ray tube is operating at 50 kV and 10 mA. The target material of the tube has mass of 1 kg and specific heat 495 J kg⁻¹°C⁻¹. One percent of applied electric power is converted into X-rays and the remaining energy goes into heating the target. Then :

Select all that apply

G1 Physics · Accepted Answer

Input power=50 kV×10 mA=500 W; heating≈495 W, so rate of temperature rise=1 °C s⁻¹ (C). λₘᵢₙ≈0.25×10⁻¹⁰ m (D). A good target needs high melting point (A), not low thermal conductivity. Correct: A, C, D.