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MMLU-Pro / 9983 / A relay is to be controlled by a vacuum photocell, actuated by the light passing…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

question

A relay is to be controlled by a vacuum photocell, actuated by the light passing through an aperture measuring 15 mm by 40 mm. At least 0.2 lumen must strike the photocell to operate the relay. What is the maximum permissible distance from the aperture to a uniform point source of intensity 50 candles, if the light from the source is to trigger the relay?

category

physics

options

  1. 78.7 cm
  2. 28.7 cm
  3. 68.7 cm
  4. 88.7 cm
  5. 38.7 cm
  6. 48.7 cm
  7. 18.7 cm
  8. 58.7 cm
  9. 8.7 cm
  10. 98.7 cm

src

stemez-Optics

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