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Paragraph: Figure shows intensity versus wavelength graph of X-rays coming from Coolidge-tube with molybdenum as anticathode: The two peaks shown in graph correspond to K_ & K_ X -rays Question: Voltage applied across Coolidge tube in (approximately)

Options

  1. A20 kV
  2. B16 kV
  3. C31 kV
  4. D18 kV

Correct answer

C. 31 kV

Step-by-step solution

eV = hc _ cut off V = hc e _ cut off = 6.626 10⁻³⁴ 3 10^8 1.6 10⁻¹⁹ 0.4 10⁻¹⁰ =31 10^3 ~V

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