Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12

A Photographic Plate Records Sufficiently Intense Lines When It is Exposed for 12 S to a Source of 10 W. - Physics

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A photographic plate records sufficiently intense lines when it is exposed for 12 s to a source of 10 W. How long should it be exposed to a 12 W source radiating the light of same colour to get equally intense lines?

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Let t be the time for which the photograph is exposed.
To record the sufficiently intense lines, energy should be same.

Energy = radiant flux × time

= 10 W × 12s

= 12 W × t


Therefore, the photographic plate should be exposed for 10 s to get equally intense lines.

Concept: Light Process and Photometry
  Is there an error in this question or solution?


HC Verma Class 11, Class 12 Concepts of Physics Vol. 1
Chapter 22 Photometry
Exercise | Q 2 | Page 455

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