Concept explainers
To Explain: Whether one bulb provides more or less illumination than two identical light bulbs at twice the distance.
Answer to Problem 10SSC
One bulb provides four times more illuminance than two identical bulbs
Explanation of Solution
Given:
Two identical light bulbs are given.
Formula used:
The expression for illumination is given by
Here,
Calculation:
From equation (1), it is found that illuminance
For a given luminous flux
Or
For the same luminous flux
Or
Divide equation (3) by equation (4), we get
Conclusion:
Hence, one bulb provides four times more illuminance than two identical bulbs.
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