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MMLU-Pro / 9504 / A camera photographs a 120-W sodium lamp 100 m away, thefilm being exposed for…

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question

A camera photographs a 120-W sodium lamp 100 m away, thefilm being exposed for 1/100s. The aperture of the camerahas a diameter of 4cm, How many photons enter the cameraduring the exposure? The wavelength of sodium lightis 5893 \AA, and all the energy of the lamp is assumed to beemitted as light.

category

physics

options

  1. 4.11 × 10^10 photons
  2. 9.42 × 10^9 photons
  3. 1.23 × 10^10 photons
  4. 5.78 × 10^10 photons
  5. 6.84 × 10^10 photons
  6. 2.67 × 10^10 photons
  7. 3.55 × 10^10 photons
  8. 1.02 × 10^11 photons
  9. 8.25 × 10^9 photons
  10. 7.20 × 10^10 photons

src

stemez-Physics

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