Practice question · Estimate
A film needs 10 minutes at 20 degrees Celsius. Using the multiplier table, how many minutes does it need at 24 degrees?
Estimate on a scale from 0 minutes (0) to 15 minutes (15).
Hints
- Find the multiplier for 24 degrees in the table.
- Multiply 10 by 0.72.
Show the answer
7.2 (answers within ±0.5 count)
Why
About 7.2 minutes, or 7 minutes 12 seconds. Four degrees costs nearly thirty per cent of the time, which is why a thermometer checked once at the start of a session and never again is one of the commonest causes of unaccountably dense negatives on a warm afternoon.
Practise Developing the Negative
The app has 7 more questions on this lesson, and keeps your place in the course. Photography I is free to start.
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