The radiant flux intensity F of light from a lamp at a distance of 10 cm is
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The radiant flux intensity F of light from a lamp at a distance of 10 cm is 0.32 W m−2. Calculate F from the same lamp at a distance of 15 cm. State any assumption(s) you make.
Where necessary, take:
L⊙ = 3.83 × 1026 W
1 ly ≈ 9.5 × 1015 m
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Related Book For 
Cambridge International AS And A Level Physics Coursebook
ISBN: 9781108859035
3rd Edition
Authors: David Sang, Graham Jones, Gurinder Chadha, Richard Woodside
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