In an X-Ray Tube,high-Speed Electrons Are Slammed into a Lead

question 30

Multiple Choice

In an x-ray tube,high-speed electrons are slammed into a lead target,giving off x-rays.If the electrons are accelerated from rest through a potential difference of 50 000 volts,what speed do they have when they strike the target? (q_e = 1.6 x 10^-19 C,m_e = 9.11 x 10^-31 kg,and c = 3.00 x 10⁸ m/s)

• A)0.17 c
• B)0.41 c
• C)0.83 c
• D)0.91 c

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